Robazoid posted... I went through it with my brother. Massive full game spoilers
There were a few parts at the end where we were straight-up guessing, and one of the big ones was that it wasn't clear to me that Edmund de-aged himself and became Lazurus. The final scenario is like "come to where we first met" and we were like, he met Lazurus somewhere between scenarios, wtf is this shit. Then we randomly put Peter in as the killer for Lazurus and that was a huge wtf moment because, what possible connection does Lazurus have with Peter?!? Then the epilogue was like "Edmund became Lazurus" and suddenly everything made sense. I really wonder which clue we missed that was supposed to make that clear!
I feel like there are a few clues (also major spoilers here):
1. Just the name "Lazarus" has some implications2. You see the experiment with the apples that Edmund carries out and his desire to get a corpse for testing3. Edmund is seemingly safe from the blast that kills the other two dudes, but Walter Keane reports that he died in the explosion. This was the clue that tipped me off since I couldn't reconcile what we saw happen vs what was reported.There's also additional stuff like the overall motivation of Edmund (eg knowing that he was politically motivated, knowing that he tried to put love potion in Mary's drink during the dinner) that help piece it together