#2 Brock Lesnar would have never joined UFC
Four years after Brock Lesnar left WWE, he found his way to UFC, making his Octagon debut versus Frank Mir at UFC 81 in February 2008.
Had he remained in WWE, obviously his MMA career would not have happened.
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This would have had a huge impact on UFC as a company. Lesnar's participation at UFC 81 and UFC 87 led to the events drawing over 600,000 pay-per-view buys.
His main event fights at UFC 91, 100 and 116 all drew over a million buys. His rematch with Mir at UFC 100 drew a colossal 1.6 million buys which was by far a UFC record. It is still second on UFC's all-time buy rate list, nearly a decade later.
It goes without saying that the UFC would have considerably less money in its coffers had Lesnar never fought for them. It is debatable whether they would be the global force they are today if it wasn't for Lesnar's incredible drawing power.