Wait....did they just fall into a big paradox? (spoiler)
If evil future Barry is evil because he lived through the whole thing with Savitar killing Iris, then THAT Savitar must've gone evil when his Iris was killed, etc. etc....when did this cycle begin???
And if Evil Barry became evil Barry because his Iris got killed, wouldn't you think he'd be more likely to want to abduct Iris than kill her?