He also had a cameo in BVS as the thug who murders the Waynes. I know, I know, nobody's here to inform, I just thought… ah, nevermind.

The alleged mystery crew member is actually Damon Caro, friend of Snyder and fight/stunt choreographer on MOS, BVS, WW and JL. I get facts weren't your goal here (engineering a meme or nontroversy or something like that, I guess?) but maybe next time…?