An average, 185+ high school wrestler will beat a Karate black belt 8/10 times if the BB has no grappling.
P.S. We had an Aikido BB walk into my BJJ dojo for an introductory class. The guy was a fat fuck but flexible, did all these crazy warm up stretches, talked some shit, did our warmup, drilled, then promptly walked out of class after sparring one white belt who was about 50 lbs lighter. The guy never came back. He wore his Aikido BB during class. I actually felt bad for the guy. You could see on his face that he knew he'd wasted years getting good at something that doesn't work in reality.