#5 Diverticulitis
As everyone knows, Brock Lesnar suffered from diverticulitis during his first run with the UFC. It hampered a great deal of his run in the world of MMA, and it's a shame that we never got to see an extended period where Brock was fighting on a consistent basis.
Naturally, this would've thrown him off returning for a while, because Brock would've been in recovery and probably wouldn’t have wanted to get into MMA so soon after having come out of such a serious illness.
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But by the time UFC 200 rolled around, the timing was perfect. Everything fell into place and Brock's medical past was behind him, allowing the heavyweight to step back into the octagon for, potentially, the last time.
We may never see him fight in that capacity ever again, but at least he got one more shot at doing something he truly loved.
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