Overeem probably makes more money outside the UFC then he would make inside it. He fights like 5 times a year if you include K-1 and DREAM. UFC HW fighters tend to get a max of 2 fights per year (because there's not enough fighters in the division to go around).
And Fedor, well, there's the whole M-1 thing.
Alistair might join the UFC if he wins this GP. Fedor, I just don't see though.
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