User blog comment:Gracchus Mccarthe/If you don't yet know it, I'm obsessed with all things Zoom. I believe my first theory about him is correct. This post shows why./@comment-26266279-20160411184627

Well here is what I think:

Real Jay Garrick made V-6 during World War II, but was not able to test it (or maybe he did and the project was stopped because of the cell degeneration issue?).

Hunter Zolomon (convicted serial killer) gains speed during the particle accelerator explosion (same day as his death trial?) which he promptly uses to escape.

He becomes obsessed with the speed and finds ways to boost it leading him to V-6 and Jay. He steals and uses V-6 and imprisons Jay so that he could make more for him.

Now that he is at his fastest, he starts posing as both a Hero (Flash) and a Villain (Zoom) - to give people hope and rip it away. But soon the effects of his cell degeneration starts to show. So now he is on the lookout for ways to heal himself.

2 years later breaches opened. He gets to E-1 by accident while running and learns about Barry. He gets the notion that Barry's speed could heal him. But first he needed Barry to get faster.

So he cleverly places himself into Team Flash posing as Jay Garrick and forces "Hunter from E-1" to swap places when he is posing as Zoom.

But when all the breaches were getting closed he was getting cut off from Barry's speed, so he decides to kill "Flash" ( his doppleganger)  to get Team Flash motivated to come back for revenge. Although it does put him in a complicated situation since he can't be inside the team anymore to observe their activities.