Board Thread:The Flash discussions/@comment-9346948-20160323000422/@comment-26624146-20160325104820

Zoom is Hunter Zolomon, Jay's Earth-1 counterpart, and Jay isn't dead. If you remember the season 1 finale before Eobard tried to leave the timeline in the ship Cisco built, Jay's helmet came through the portal and Eobard said "that's my cue to leave" meaning he knows the helmet. As we've seen recently Eobard's younger self is still alive where we saw him learn about everything he knows in Season 1. This means that no only will Eobard be back in the near future but he has to encounter Jay at least once in order to know about the helmet. This can't happen if Jay is dead.