Many NFL fans were curious to see how Bill Belichick would fare at Netflix's Tom Brady roast Sunday, and the long-time Patriots coach didn't disappoint with his performance.Belichick showed off his comedic Chris Hubbard Jersey side, delivering several barbs to his former star quarterback and eliciting big-time laughs from those on hand for the event.None drew a bigger reaction than the shot Belichick took at Alex Guerrero, Brady's "TB12" collaborator."People say that Tom and I butted heads a lot, and in a way, that was true, but not really," Belichick said. "It was hard to butt heads with Tom because he was so far up Alex Guerreros a s."The joke of the night for fans?It was hard to butt heads with Tom because he was so far up Alex Guerreros a s. Henry McKenna (@henrycmckenna) Naturally, that joke was well-received, as Guerrero was a central figure in Brady's final days with the Patriots. Tensions boiled over between Brady and Belichick, in part, because of Guerrero's presence with the team, so hearing the coach take a good-natured dig at him delighted those aware of the drama.Here's what to know about Guerrero and his relationship with Brady after the alternative-medicine man caught a stray from Belichick during Brady's roast.MORE: Alex Guerrero was referred to as Bradys "spiritual guide, counselor, pal, nutrition Baker Mayfield Jersey advisor, trainer, ma sage therapist and family member" in. He is the godfather of Brady's son Ben.Guerrero trained several notable NFL players during his career and worked closely with Brady. Together, they created "The TB12 Method" and TB12 busine ses while Guerrero trained Brady and several other Patriots at his Foxborough facility.Many members of New England's Super Bowl 51-winning team worked with Guerrero, including:Danny AmendolaJacoby Bri settJulian EdelmanJimmy GaroppoloRob GronkowskiDuron HarmonChris HoganGuerrero also worked with players likeLaDainian Tomlinson and T.J. Houshmandzadeh early in his career before his a sociation with Brady and the Patriots grew.Of course, Guerrero's careerhas not been without controversy. He was barred from being called a doctor by the Federal Trade Ozzie Newsome Jersey Commi sion after claiming a supplement called "Supreme Greens" could serve as an "effective treatment, cure and preventative for cancer, heart disease, arthritis and diabetes, and as a means of achieving substantial weight Sione Takitaki Jersey lo s of up to 80 pounds in eight months," per. Supreme Greens is a blend of vegetables, herbs, vitamin-rich gra ses and MSM.Guerrero received a degree intraditional Chinese medicine from Samra University in Los Angeles. The school closed in 2010.MORE:Belichick and Guerrero didn't have the best relationship, which led to tension between Brady and the legendary coach during the end of their time together in New England.In 2017, Belichick stripped Guerrero of team privileges the Patriots had previously granted him.This included the following, according to :Guerrero was banned from boarding the Patriots' team jet.Guerrero had his game-day sideline acce s revoked.Guerrero could no longer treat players besides Brady at his Gillette Stadium office.Guerrero was never an employee of the Patriots, but he had served as a team consultant and was given "free rein" around the building, per . But Belichick wanted to "permanently clarify Guerrero's Greedy Williams Jersey role" and "draw sharp boundaries" around him with players feeling like they had to work with Guerrero to earn Brady's trust.MORE: In e sence, Guerrero became a pawn in the power struggle between Brady and Belichick. While Brady didn't outwardly display much animus toward Belichick about the decision, he clearly harbored some resentment for the coach's choice.This was hardly the only factor that undid the most succe sful coach and quarterback combination of all time.But as Belichick's barb at the Brady roast reminded NFL fans, Guerrero was a key figure in the demise of the Patriots dynasty.