BJ ain't lying. He was a TRUE fighter, he fought because he loved competing and testing himself and was not afraid to take on bigger and stronger men to test his limits, even if God forbid he took a loss. He grew up in a hyper privileged family and was mad rich so he did not have to fight for any reason other than he loved it, but this also hurt him as he had issues with staying motivated.
Khabib fans are delusional and rabid in these parts - there is a reason they are continually voted the worst fans in the sport above Diaz, McGregor and even Rousey fans, so do not expect them to understand what BJ is saying. The reality is Khabib cut from 195 down to 155, missed weight 3 times (actually 4 considering his last fight), risked death, pulled out repeatedly, because he was afraid of not having the strength and power advantage. Against Usman he would not be able to rag doll him so he would never take that fight - instead, he did what Andy did with Jones, Machida and Jacare and became friends with his hardest match up so he had a cop out. Even vs GSP he did not want to fight at 170 and wanted old man GSP to come down to 160.......that is the polar opposite of BJ, who legit fought a young Machida at heavyweight and is at best a modern day featherweight.
BJ may have been his own worst enemy, he did not care about spotless records that simps get hard over, he struggled with addiction, consistency and motivation, but the dude was an absolute savage at his best and was definitely as dominant at 155 as Khabib was in his time. He also did what Khabib will never do: cowboy up, fight a larger man and win a second title. BJ's insane TDD and boxing would have made for a really difficult match up for Khabib too, but don't expect the fan boys to acknowledge any of this without rattling off a laundry list of excuses.