User blog comment:Kir the Wizard/Thawne's Deadline – The Black Flash!/@comment-24152851-20170116104257

I think the Time Wraiths were initially intended as the Arrowverse version of the Black Flash. However when Zoom got dragged off to Speed Force hell, he started decaying and looking like the Wraiths, so maybe Zoom will be the Black Flash that's spoken of here. I doubt we've seen the last of Teddy Sears given how much the cast and fans love him.