Yes, some Cheng flashbacks are definitely warranted, although I don't expect the show to have that much continuity. My Grandpa was a soldier in WWI, and when he died in hospital in the 1970s, he was convinced the Germans had got him. Poor guy.

GAH. I kinda hope the writers don't take Jack there, although part of me also wants to see the angst. Especially with Renee watching. Is that sick? That's pretty sick, isn't it?