Silva is a monster athlete and that's what lead to that fight being so back and forth. Silva was able to keep getting to his feet. Diaz would not be able to do that
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Diaz is one of the best athletes in MMA, which is irrelevant because he can beat Fitch on the ground. Erick himself nearly submitted Fitch, that's not athleticism it's skill, and Nick has better Jiu Jitsu than both of these guys.