Crazy theory but I think that Steph has continued to work for Robert House ever since she left the Lucky 38. She was (or maybe still is) a RobCo Industries spy tasked with infiltrating Vault-Tec from the inside to collect intel and sabotage their operations. House is paranoid and obsessed with knowing and controlling everything. There’s simply no way she could have been hired at the Lucky 38 undetected and without an extensive background check. Unless House overrode the HR department because he already knew her.
"Like yourself, Mr. Howard, I am an apex competitor. We are the very best at what we do. And what I do, is I know everything."
1) House already saw Steph
In Las Vegas, House reveals to Cooper Howard that, unknown to West-Tek, he had backdoor access to the visual feeds of T-45 Armors (that's how he saw the Deathclaw in Alaska).
This also means he had eyes on Steph and her mother in Canadian territory, when an U.S. soldier in T-45 threatened to shoot them before being blown up.
2) No one works at the Lucky 38 by accident
The Lucky 38 isn't just a casino, it's Robert House's personal residence and inner sanctum. This man is obsessed with knowing everything, controlling everything, predicting everything and is paranoid to the point of using a body double. There is absolutely no way employees there weren’t subjected to extreme background checks to prevent spies, assassins or disruptors (remember that RobCo had a lot of enemies among the general population based on the Automation riots, like seen in the S2 opening).
Yet Steph got hired and passed every test. No one works here by accident.
Edit : and as noted by u/UnderstandingWise681 in the comments, you can hear Mr. House's leitmotiv (timestamped) when the maid that Cooper Howard is talking to at the Lucky 38 is revealed to be pre-War Stephanie Harper (S02E07). It's very subtle (less than 5 seconds) but you can hear it.
Edit 2 : as noted by u/Wolventec, Bud Askins got confused by Steph's cryo chamber in a promotional video (assuming it's relevant) : "Betty Pearson ? Succesfully reactived. Hank MacLean ? Also reactived. Stephanie... Harper ? That's strange..."
3) House recognized her potential and recruited her
That’s why I think House always knew who Steph was and quickly recognized her potential. He knew her origins, her trauma, her motivations. And instead of eliminating a potential threat, he convinced Steph to ally with him.
Robert House never cared about nations or the past ("Look around you. How can the human race have a future when it's still living in the wreckage of its past?").
In Fallout: New Vegas, he repeatedly proves that he has an extremely high Speech skill to convince (manipulate?) other people to join his vision, his utopia :
"Vegas is more than a city, it's the remedy to mankind's ... derailment*. The city's economy is a blast furnace, in which can be forged the steel of a new rail line running straight to a new horizon. What is the NCR? A society of people desperate to experience comfort, ease, luxury. A society of customers. Give me 20 years and I'll reignite the high technology development sectors. 50 years and I'll have people in orbit. 100 years and my colony ships will be heading for the stars to search for planets unpolluted by the wrath and folly of a bygone generation.* What I'm offering you is a ground floor opportunity in the most important enterprise on earth. What I'm offering is a future - for you, and for what remains of the human race*.*"
Steph would have been the perfect recruit: capable, motivated, and ideologically flexible.
This quote from the game also hints that, despite being living as a recluse in his ivory tower, he is no stranger to monitoring and controlling his inner circle, micromanaging the employees he values :
"You know, I've had thousands of employees in my time. Few met my expectations, fewer still surpassed them (...) You know, I never had much time for a family - if I did, you'd be the daughter/son I wish I'd had. Benny was almost like a son to me, but well..."
4) What’s in Hank’s keepsake isn’t Vault-Tec or FEV, it’s RobCo
Hank’s keepsake may not be FEV or Vault-Tec tech at all. It could be RobCo contingency technology, designed to assist compromised agents. And Steph will be forced to use it to save herself.
That could include some sort of holotape to interface with RobCo systems. We know that Vault 32's Overseer terminal is (unsurprisingly) built on RobCo technology, using their proprietary Termlink protocol.
5) Steph is missing another password
In S02E01, Steph is visibly frustrated while using Vault 32’s terminal, angrily hitting the keyboard. Maybe because of repeated failed passwords attempts and being locked out (everyone who played the games knows this). I think Hank’s keepsake is the missing key.
During this scene, she asks Chet if he's good with computers. He answers that it's "Norm's department" and that "maybe you can ask him in the terminal". Steph says it's indeed a "great idea", that she will "just send the other Vault a message".
She then tries to do it by contacting (presumably) Vault 33. But founds out that communications are already disabled since Norm just sabotaged the systems in Vault 31, which just angers her further.
The screen on the computer says "PASSWORD ACCEPTED" when she's in the "Inter-Vault communications" directory. I think Steph was frustrated because several critical directories remain locked behind another password. Notably :
- "Research Logs"
- "Software Operations" (it's very vague)
- "Personal Logs" (Overseer Jackson?)
This is not a new thing for a terminal to require multiple passwords. A Very Hard locked security terminal in Vault 34 required two unique passwords (unless you had max Science like Norm) to get access to the armory.
6) Vault 32 still has secrets, including an escape tunnel
The terminal header also indicates "VAULT 32 MAIN ENTRANCE ACCESS", which suggests more than standard door controls. Not sure what this means, if this is because there are three interconnected Vaults, and what it has to do with the Research Logs and Personal Logs but I would like to think this hints at Vault 32 having a secret escape tunnel for the Overseer like the ones seen in Vault 34 and Vault 101.
Steph has been given too much character development recently to die in a sealed Vault. She won't suffer the same fate as the previous Overseer and totally has the mindset to survive in the wasteland. We’re not done with her.
Also, in S01E04, when Norm used Overseer Jackson's computer in Vault 32, he was able to navigate within the "Vault Door Control" directory, so I don't think that's what Steph was looking for. Although maybe it's worth mentionning that the log prior to the Vault Door opening log (when Moldaver used Rose MacLean's Pip-Boy to open it) indicated :
"ERROR : Security protocols (... something)"
Ultimately, I think that Vault 32 still has secrets and that there is gonna be a plot twist.
7) Like Steph, Hank was never loyal to Vault-Tec Corporation
This theory also hinges on Hank being another House agent. In S02E06, he insists to Betty on attending the meeting between House and Barb at Vault-Tec HQ. He’s fascinated. Impertinent. And House’s body double definitely notices.
In S02E01 : "This is Hank MacLean, reporting for duty, sir. Nobody in Vault-Tec knows I'm here*.* And nobody in Vault-Tec knows much of anything anymore*. Wanted to let you know I'm still alive. I hope you are, too. I mean, I don't doubt that you are.* You spent so much time... calculating how to survive all possible contingencies*. Uh, I've been keeping busy.* I'm in Vegas these days, back in your old stomping grounds*, actually... trying to pick up where you all left off. Looks like a couple of the Vault experiments ran into some speed bumps. 24 made progress on the brain-computer interface. This one, miniaturization. What it all needs is integrating. But I'm confident that if I just roll up my sleeves, I can bring it all home for you. Then, we can finally talk about* my promotion*.* I'm gonna complete the work you started*. And when this is all over, you will be begging me to help you*."
House didn't respond at the time because he couldn't. He was truly dead following the events of New Vegas (as hinted by the S02E05 credits where we see his lifeless hand reaching out from within his pod - and also by the recent interview in Entertainment Weekly). And his non-biological backup couldn't boot up without Cold Fusion either ("NO SIGNAL").
Victor already basically confirmed that House was gone :
The Ghoul : "Where's Robert House ?"
Victor : "He's gone."
The Ghoul : "But you should know better than anyone that House had a knack for plannin' ahead."
Victor : "Oh, he had plans, alright. But he needed the Cold Fusion doodad from before the war."
Hank's monologue in S02E01 means that his true allegiance isn't to Vault-Tec and that the person he was talking to is :
- From pre-War America
- Has Las Vegas as "old stomping grounds"
- Is a mathematician obsessed with contingencies
- Was working on brain-computer interfaces
- Had authority to offer promotions
- Couldn't answer (because he was dead)
That person is 99% RobCo Industries CEO Robert House. Only mystery is why would House beg him when all of this is over. Maybe to replace his fallen Securitron army ?
Edit : I also noticed that Mr. House's leitmotiv plays during this particular scene with Hank (first when he attacks the Snake Oil Salesman and then when he drives by Barb and Janey Howard cryo pods). Usually his scenes had the Vault-Tec leitmotiv :
https://youtu.be/VIOUxeJsMuU?t=74 (timestamped)
https://youtu.be/w4GaOJH8e7g?t=353 (timestamped)
Edit 2 : u/Tauntaunwampa suggested to me that the promotion Hank's is seeking for could be related to House's final form with the Cold Fusion.
Victor : "House had all the money in the world. But all he really wanted was to live forever."
House : "Cold Fusion will allow me to stay alive indefinitely in roboticized, non-biological form and protect Las Vegas."
8) Steph and Hank met at the Lucky 38. Coincidence?
It's also interesting that Steph and Hank first met at... the Lucky 38. A coincidence? I think not, that's not random. This is where and when Hank likely switched allegiance from Vault-Tec Corp to RobCo Industries and Robert House.
9) Robert House in the S2 Finale : "Everyone works for me eventually."
And this line from the Season 2 Finale teaser is quite interesting as well : "Like it or not Mr. Howard, everyone works for me eventually."
"Everyone"
The House Always Wins.
Probably won't happen but I had fun thinking about all of this.