Originally Posted by
king81992
Brick is too obvious, but so far the writers haven't shown themselves to be creative and may go with the easiest solution.
Billy could be Red X, but that would be random and barely makes sense. Allying with the SS even if it was to double cross them for reasons( was it ever explained WHY Red X went through all the trouble to backstab the SS in the first place?), would be incredibly out of character for him
My guess is that Red X is a character associated with the Titans who's undercover for reasons. Dick and company may already know Red X's identity, which would explain why they come off as nonchalant about figuring things out. Red X might be acting on their behalf.