Being an effective striker is not about how many combos you use, it's about whether or not you can hit your opponent. Mayweather basically used left jabs and right straights, as single punches, towards the end of his career. Still beat everybody because he was able to land. Kelvin is an extremely effective striker in MMA, that criticism isn't worth a damn until he has one fight at 185 where he doesn't hurt his opponent.He also has like 4 combos in his arsenal. He's a limited, short range striker who is extremely reliant on his opponents making mistakes and walking themselves into his punches. .