User blog comment:Sci100/Sci100's Speculation and Theories on the Arrowverse Flashpoint/@comment-26765014-20160527082450

I'm pretty sure that after the Flashpoint arc is finished, the main villain will be the Black Flash. As for how you described that other shows will still maintain their timeline, even tho that is the bigger possibility, I would rather have a few eps of Robert Queen Arrow, Legends trying to figure out whats changed and Supergirl trying to figure out why she in a different world. But if what I'm saying is true then there wouldn't be a need for the Four-Part crossover, now would it? Besides Legends already has a JSA arc planned and Supergirl has the Mysterious Pod arc, so what I'm trying to say is, you're probably right, with the exclusion of Mirror Master.

P.S. What the hell? Where've you been? Everyone thought you left.