Board Thread:The Flash discussions/@comment-9346948-20181205013242/@comment-29295626-20181205095206

Zoom's appearance was quite interesting, although I think his short on-screen time sets up for his return. I could be wrong, but here are a few reasons why:

His abduction by the Time Wraith - yeah, they could've just dragged him back to the time prior him chasing current Barry & Nora. It's unlikely that he'd forget seeing a future Barry and Nora, however, the writers could easily use time displacement (like we saw in Flashpoint) to explain the timeline being untouched. Or that was one of his time remnants running around.

If he returns, it's probably because he's an alternate timeline remnant - the weird part of all this is that current Barry is apparently starting to become his 2024 self, as noted with a visit to Season 1's Thawne, who was aware of Savitar and Cicada in this new timeline. Although Season 1's Thawne is actually Flashpoint Thawne which explains how he knows this information. The Speed Force already kind of has a history with Zoom executing his Season 2 plans, and it's unlikely that they'd turn him into the Black Flash again, because it'd create a loop. Rather, they probably took him away to fill the void in the Speed Force Prison. (Though, the Speed Force Prison could also be a way to explain his memory loss and keeping the timeline intact, stuck in their long enough he goes "insane" and forgets the meeting he had with Barry and Nora)