Not to downplay Tyrant's win, he has the best Grundy right now along with Mikemetroid, but I feel he beat people who didn't know the matchup or just lacked skill. If he played an equally skilled (Tyrant was the most skilled player that night) Superman or Batman, or Black Adam, he wouldn't have made it far. Hell the only Superman that could have beaten his Grundy there that night was Tyrant's himself. Valle didn't push block him when he was cornered not even once during their fight from what I remember.
On a different note, Rip ditching his scruby Superman to become an even more scruby Batman was both embarrassing (at all his combo drops) and aggravating (at him still winning a lot of fights for no understandable reason).