The hard part is, fighters will often cross train, or have a home gym but fight under a team umbrella..... Case in point, ATT is a team and an umbrella, there are plenty of fighters who fight under that umbrella, but train out of a lot of gyms (Ben Saunders, he trains in SD with 10th Planet Oceanside, in Orlando with Bobby Robare, but flys the ATT flag), or the DDS, they train out of multiple gyms (Ocean Jiu Jitsu, 540 gym, Ricardo Almeida, RGA, Tom DeBlass) but all are under the Renzo/DDS/DeBlass association.
Home gyms and fight teams/affiliates are two different things at times, so are inquiring about gyms or teams?