#3 Cain Velasquez
Back when he was the UFC Heavyweight Champion, pundits have already began floating the idea of matching Cain Velasquez up against Jon Jones. However, the tides have changed: Velasquez lost the title and became more sporadic in his fights; and Jones got into the mess that brought him to his current state.
Stylistically, however, it is a fight that can still be considered to be a dream match. It would be interesting to see how Cain's smothering pace and elite wrestling would fare against Jones' strength and creativity.
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But in the meantime, it would be nice just to see either man get back on track with their careers, and hopefully have a smoother sailing run for both.