2) The Accelerated Man
Who? This Earth-19 version of The Flash made a blink and you’ll miss it appearance during a recent episode where we learned that Gypsy is working with him, so it’s entirely feasible that he’ll follow her to Earth-1 and somehow wind up trapped inside the Speed Force. We know so little about him that it may seem like we’re jumping the gun here, but I for one certainly don’t think that he was thrown in for a simple cameo appearance and nothing more.
Sure, it made for a fun Easter Egg, but the Scarlet Speedster’s actions spelling doom for him or the Accelerated Man having some dubious motivations are two suggestions which make perfect sense. The fact this character is essentially a complete unknown could lessen the impact of the ultimate reveal of him being Savitar, but it might still make for an interesting path for season three of The CW series to go down.