Size is good but he needs to improve his wrestling. Brock will destroy him regardless of his size. Another thing is size=/=strength. Brock has been his size (and bigger) for years--since his high school days while Frank is bulking up at the age of 30. The last point is that Frank's style isn't really suited for a guy who is bigger than his optimal size. BJJ isn't really an art where you can bully a guy around when you have a size advantage--its not wrestling. Size will be an advantage against some non-wrestlers but I think that Cain and others would still throw him around like a ragdoll (and Cain is 240).