Entering this season, the idea of Reverse-Flash coming back wasn't something that I'd really considered a possibility. He'd been defeated, Eddie Thawne had sacrificed himself, and there was a big new villain to deal with. And then, well, he came back. It's still not totally clear how or why he did, but the fact that he returned from the dead (or simply lack of existence) was a big surprise, and does throw up the potential for him to come back again as the series progresses. Not this season, but in Season 3 or further down the line, could we once again have him appear, each time getting more and more clues as to what he has been doing, coming from various points in time, and essentially being The Flash's main, recurring nemesis?