Good review, but...
FLASHBACK NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
...
I don't see that as evidence for her knowing. Plus, if that turns out to be the reason behind it, MJ suddenly becomes a really shallow hero-worshipper. And she'd probably be acting more in awe, having less suave sexiness. There's no solid evidence--just easily discreditable circumstantial evidence. But I guess we'll see.
Isn't it more a flash forward at the start since the whole episode has a normal time line but the pre-credit sequence shows a segment of the climax?
I think she does know about Peter and a reason for liking him could be "hero worship" but her knowing can be taken as her knowing the real Peter and liking him as person.
Oh, by the way, anyone else not think Tombstone is the real Big Man?
I don't know. Maybe it's the way he never calls himself the Big Man, or how he always refers to the Big Man in the third person. Maybe it's the way Frederick Foswell stood up for him.
I read an interesting post that indicated that generally speaking a mafia type boss would not usually refer to themselves in the third person; this protects them when talking to someone who is wired.