#3 Cain Velasquez
Boy oh boy, this would be tough for Brock to swallow. Cain Velasquez, the man who took Lesnar's UFC Heavyweight Championship and gave him the scar under his eye, could do great things as Heyman's Beast.
Whilst he may be one of the weaker choices on this list, Velasquez' style would be very much based around mat work and pounding his opponents until they can no longer get up.
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You likely aren't going to get anything fancy from Cain as was the case with Brock, but that doesn't mean you aren't going to enjoy yourself watching him.
Heyman could spin some utter gold on the stick by insinuating that Velasquez was always the better man and whilst it may not be a long lasting partnership, it would certainly be profitable.
Who knows, maybe it could even lead to a future Lesnar return in order to build up a solid storyline. The match itself may not be too great and fans would probably criticise WWE for somewhat 'copying' the UFC, but you can't deny that it would draw in some casual fans.
If anything, you could make it a strong style type bout. That's like printing money.
From a former world champ to the current one.