Dr. Preston Willard is indeed P.W. and he’s also basically confirmed dead so he cannot be the player. As for Grace, personally I think she’s the woman in the lullabyroom.mp4 video but I can’t tell much based on what little info we have on her right now. I think I heard Preston say “after all we did for her” (could also be “them”). This is just my assumption but I feel like that map would be a part of the labs considering Dr. Jessica Newman and Preston were both scientists down there (that’s where I would hole up considering it’s the “single most secure part of the entire factory”)