That dojo storm sht is more of a jujitsu thing maybe that mogli guy got insight on that everywhere else is more of a green light system where if u come as a tough guy one student gon give u the easy win in sparring to up ya confidence then the next up is going to knock your head in
Fake jiujitsu guys get called out every day b. It's so easy to trace the lineage because the art is still so modern. There's NO one in this sport who can't be traced if he's talking that black belt shyt and teaching.
The other arts have been around so long that people don't do their due diligence when researching the school and I'm not sure what resources are available to so but I'm sure in their circles it's not hard to find out
I'd reccomend training under a legit champion if you're want the best training. Plaques on the walls, trophies on the mantal and an easy to trace lineage back to the True Masters.
Otherwise you're really taking a gamble.