User blog comment:TheDoctor230/Barry Allen Is Savitar/@comment-26266279-20170409150610

Well the producers and the actors said its someone no one is expecting and that there is no real clue to his identity so.... So Barry and Wally looks less suspicious now.

More plausible suspects now are

1) someone presumed dead like Ronnie or Eddie

2) someone Team Flash trapped somewhere even if it wasnt on purpose like Jay Garrick (His physique even matches Savitar's)