In that case he FORGOT that he discovered Deathstroke identity too.. Not sure in N52 but.. In the previous continuity GRANT was a Big Deathstroke fan too.
I wonder if he is a MOTHER SOUL subbordinate(resurrected with Lazarus Pits) too to avoid others winning this Tournament and fulfill her plans.
Also Williamson said that MAYBE we saw him before or maybe not.
Nobody knows RED X identity in.. Future State Yet? Wow. I was not expecting that.