Reintegration Evidence (S2E01)
This shot from the premiere of season 2 is sticking in my brain. WHO is this lurking in the halls behind Mark?? Obviously Graner is gone...
And then it clicked for me. This figure kind of looks like Mark, to me (even the way he stands/the cut of his suit is spot on!).
You know who else hallucinated seeing themselves? PETEY. When he was going through REINTEGRATION. (image from S1E02. these stills even look good side by side!!! brilliant.)
Perhaps learning the massive truth about Gemma/Ms. Casey is potentially causing some sort of REINTEGRATION level of bleed-through in Mark (or forced reintegration), and this scene may be alluding to that. I genuinely wonder if he is just going to slowly but naturally reintegrate during the season?
Edit: Just to clarify, I do not think Mark is full-blown reintegrated. (Although I will say it is entirely possible that OUTTIE Mark got the procedure done, unbeknownst to the audience, and the process is not instantaneous so maybe innie Mark will keep seeing weird shit until he's more reintegrated?)
I also think it's possible Mark S. is experiencing the start of something akin to a natural reintegration process, triggered by mind-shattering info (Gemma being alive) and could be experiencing the start of a slow trickle of reintegration unbeknownst to him at this moment. (Think Irv and all the bleedthrough he's experienced, but imagine that reaching a culminating point where it essentially becomes reintegration.)