Board Thread:The Flash discussions/@comment-9346948-20161207015203/@comment-24476516-20161219215315

Xandermcc wrote: Kaestal wrote: He wasn't unknown!!! He was the Death for Speedsters!!! Yes he is. But the person behind the shredded cowl is unknown. He had to be a speedster long ago. The comics probably have an ancient speedster from a long time ago, (that is just my theory cause no one knows who he was) but you can't do that on the show since every person with superspeed was given their powers when the particle accelerator went off.

Not every person with superspeed was given their powers by a particle accelerator. Reverse Flash recreated its effects, Trajectory used the velocity, Wally in Flashpoint was hit by lightning in his car, Wally in present timeline was transmutated by Alchemy, as was the Rival. Jay and his speed were never explained. The Rival, his speed, and his red lightning were never explained. They could've done an unexplained Black Flash just as easily.