Yeah, i definitely agree if the father is already on the show by this point, which it seems that he is, that he is probably going to come face to face with Emma and then they are going to end credits before a break. Which is going to suck.
I think i would be much more of a fan of there being no jack shown. Just the giant and have Emma and Snow there. I mean i still think that Henry’s father is going to be Bae even if i don’t want it to happen, so i don’t think he is going to be Jack. It is possible his fake name is Jack though.