whatever happened to Dirk during the aftermath of [s] Game Over, when he and John were floating around in the debris? and does that have anything to do with why he hasn't been in any of the updates since Caliborn's claymation clips?

After Game Over Dirk was overcome by a mass of stardust.

But that doesn’t have anything to do with why he isn’t in the upd8s.  He isn’t around because Jade teleported him outside the incipisphere and he’s currently flying back.