User blog comment:TheDoctor230/Theory on How Savitar Could Be Future Barry/@comment-26537965-20170416141516/@comment-24152851-20170417040827

That could be attributed to a bit of timey-wimey shenanigans. Savitar could create a paradox that would end up altering a future he wants to change, or something like that. I've seen Doctor Who and other similar stories do that sort of stuff all the time.