Dustin is a significantly better grappler than Leon, and a better striker. He's been subbed the 3 best grapplers in the UFC with 44 subs between the 3 of them, and Leon hasn't fought anybody who's as big of a submission threat. RDA didn't have the wrestling to get him, but he went to split decision with Gunnar Nelson, nearly got KO'd by Nate Diaz, and ended the fight on bottom getting pummeled against Colby on a 2 layoff with a broken foot. Leon has 1 come from behind finish in his last 8 fights, while Islam has finished 7 of his last 8.