There should never be "P4P GOAT" discussions...it's a pointless argument for people who just like to argue, and there are too many variables to come to any consensus.
MM is the GOAT for his weight class, no question.
JJ cleared out a stacked LHW division granted on GEAR having popped multiple times. Anderson cleared out MW despite popping. GSP cleared out WW despite ducking a PRE USADA era and HENDRICKS rematch. DJ ducked TJ, refused to fight, and picks to pad his record with canlets. I was more impressed with Borg who I never heard of before taking a thrashing then DJ padding his record and running away from a TJ fight. Paper champ is paper. Also, GOAT MANLET status doesn't sell.
If DJ called out winner of Cody vs TJ, people would have respected him more but, he doesn't because he hopes to pad record more with canlets. Fedor was the GOAT Can crusher but, DJ has stole that title.