Question: John Will completed his blackbelt under one of these men, a brother renowned for his BJJ skills?
Sentence (from "Ricardo Migliarese"): Ricardo “Animal” Migliarese (aka Rick Migliarese, born December 17, 1978) is an American born professional Brazilian Jiu Jitsu grappler and a 4th degree Relson Gracie Brazilian Jiu Jitsu Black Belt with approximately 20 years of experience in BJJ and Mixed Martial Arts.
Relevant evidence: No