Looking past their weight, which one is the toughest? How would other greats like Lesnar,Fedor,Overeem,Lyoto Machida, Rampage, Randy, Chuck, Dan Severn and Don Frye measure up?
Otherwise, what are your predictions for the future of those still-going? I say GSP will outclass Nick Diaz over all the rounds, JDS will beat Cain through superior strikes/take it over all rounds, Fedor will win in Russia/Japan and come back, and Reem will beat Lesnar because he has striking AND grappling as opposed to Lesnar who relies on wrestling (plus Brock hates getting hit).
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Otherwise, what are your predictions for the future of those still-going? I say GSP will outclass Nick Diaz over all the rounds, JDS will beat Cain through superior strikes/take it over all rounds, Fedor will win in Russia/Japan and come back, and Reem will beat Lesnar because he has striking AND grappling as opposed to Lesnar who relies on wrestling (plus Brock hates getting hit).