Oh I know they will undo the snap...I just wonder if he is the key to the time travel...like I guess what I'm saying is does he gather some of these heroes to help in that fight? Could we have two Caps? Does he get a past Dr. Strange to help rescue the current Dr. Strange? And so on.
Of course the snap will be undone...just seems like a big fat clue that he will be the guy to do some things with the huge drop of the term "time vortex" AND the well placed movie quote about tiny universes AND the lecture about alternate universes. Too many potential hints for them all to be for nothing, in my opinion.