TLDR: I wanna prove that this Judo brown belt is a fake. Is there a way to check it?
I'm a BJJ guy first and foremost. Our gym had a visitor lately. He's from another country and claims to be a brown belt Judoka. He wore a Judo gi and a brown belt (no black bar, so it was clear that it wasn't a BJJ one).
He was interested in teaching our gym Judo. He tried teaching but there were too many red flags.
My friends said that he told our smaller teammates that some throws won't work, slammed one of the smaller guys onto the mat with a big throw and leaving him in pain.
My experience with this dude: we did a shark tank thing (shark has to pass guard). He couldn't even hold closed guard. Understandable, probably not a newaza guy. But I figured a brown belt should at least have some idea. He also kept on skipping turns claiming he got cramps or something.
Then we rolled. Free spar. The dude just tapped to a kesa gatame. A fucking Judo pin.
It really raised some alarm bells for me. In our gym we have a BJJ brown belt who also holds a Judo brown, and he just laughs at my kesa gatame attempts.
We also have a white belt who'a a Judo black belt, but he's busy and can only drop by whenever he can, and I learned a lot from him. Both of theae former Judoka can easily escape my kesa gatame, or at least prevent me from getting into it. And with the Judo black/BJJ white, he's at least competent with getting subs after a throw. This new guy doesn't.
But when I did this to the visiting "brown belt" he just tapped. His reason? Not good at newaza. After that, I could tell there's something quite not right about his brown belt.
I also intentionally left my guard down to be thrown. He got me with an osoto gari but when he took me down for some reason my guard retention attempts make him fall to the mat lol and I ended up in side control.
I would have left it all behind until he started pestering my coach and his staff. He really wanted to teach us Judo for some reason. They already explained that we don't need a new coach, and that the team already has a Judo black belt who's willing to teach us throws when he's around. He still won't take no for an answer and is getting quite aggressive.
Is there a way to check his legitimacy? I figured if we out him for being a fake, he'd at least leave us alone. He's really annoying the team was uncomfortable when he was around. He keeps on giving unwanted advice, scolding a blue belt for accidentally wearing his gi right over left, and many more.