User blog comment:Eobard95/BARRY'S GONNA DEFEAT SAVITAR BY RESTORING THE PRE-FLASHPOINT TIMELINE!/@comment-26537965-20170512180617/@comment-26624146-20170513032737

But Savitar is the result of a time loop which started with Iris death which led to Barry creating the remnant that went insane and killed her to ensure it's own existance. Iris didn't die in the Pre-Flashpoint timeline so there'd be no reason for Barry to create the time remnant that becomes Savitar so therefore, there was no Savitar in Pre-Flashpoint.

Cisco went unaware of his powers for 2 years and it took his death in an alternate timeline to trigger it. Caitlin's powers are also triggered by moments of highened emotions and Caitlin is known for trying to deny or supress this, so she could have held out for 3 years before it started to affect her, and I think losing 2 boyfriends and being trumatized would be enough to do this.