#4. Roman Reigns wants to face Brock Lesnar at full strength
Roman Reigns has already defeated Brock Lesnar several times in the past and at some point, the feud needs to come to an end.
Brock Lesnar isn't at full strength without Paul Heyman in his corner offering his advice and pushing him to be The Beast. Roman Reigns is aware of this and even though he gives off the impression that he will do anything to retain that title, he also wants to prove that he is the best.
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Beating Brock Lesnar at less than full strength wouldn't be enough to stop Lesnar coming for another shot at the title.
Reigns and Lesnar are seemingly destined to do this forever and it appears as though they could be facing off again after WWE Day 1 if rumors are to be believed.
The Universal Championship has come between these two men many times and if Reigns wants to prove that he is a better champion than Lesnar, he has to hold the title without Heyman in his corner.