I don’t see how you can believe that. Blue?? I’d guess he’d run through most purples in his weight class. Not sure why he wouldn’t be a legit brown belt with the years of training he’s had.Based on observation. You may obviously disagree, but he doesn’t look like a brown belt in BJJ. Highest level I’d put him at is purple, if we’re talking competition based practitioners, then he could very well be a blue belt since modern blues are so much more professional and knowledgeable compared to 10 years ago.
But again, people are saying he’s a legit brown, which does seem gifted to him as another mentioned.