I've said it once and I'll say it again. The subtle details in his movements that give it away. You should be able to watch his vids a couple times and pick him apart.. It doesn't matter who says what. Watch his movements. David Lang has a legit black belt (legit: given to him by a real bjj blackbelt). He's terrible, blue belts crush him and he is widely known as a huge fraud. Just because someone has a black belt don't mean shit. Ari has a bb, Quick has one too..