What does this have to do with how big a sport is lol? You don't seem very smart.
MMA missed out on a ton of great match ups too. We never got Fedor VS Randy/Brock, Anderson vs Machida, Ronda vs Cyborg, Aldo vs Pettis, Khabib vs Conor (hey you put GGG vs Canelo), Jones vs Cain, Wandy vs Cguck was 5 years late etc... Both sports have missed a ton of great match ups. At least Boxing gave us Manny vs Floyd when they were both ranked in the top 3 P4P. MMA never gave us out Manny vs Floyd (GSP vs Anderson)