No doubt Mike Brown and Steve Mocco are outstanding wrestling/MMA/MMA-Wrestling coaches, but ATT also lost Kami Barzini who was an outstanding wrestling coach. And ATT Kendall may have Vila, Romero, and the rest of the Cuban wrestlers but the only one with a proven track record as a coach (Alexis Vila) is having serious legal problems at the moment and I don't think he is still heading up that gym.
AKA has DC, Cain, Jamil Kelly (much of the time), Khabib, and all the top wrestlers DC attracts to that gym.
You cant discount Jackson's either. Izzy Martinez might be the most accomplished MMA wrestling coach there is.
You also cant forget Kami Barzini's new home, Combat Club, who also has Greg jones and Bebak Nejad. Hell, Long island MMA might be right up there too with Kyle Cerminara as head coach along with Ryan laFlare, Gregor Gillespie, Bermudez, etc.
There is also Antonio McKee's gym and Koscheck's as well. And Roufusport is closely associated with the Askren Bros wrestling clubs.
There are a bunch of places for fighters to up their wrestling.