Quality over quantity for sure.
The last 2 threads I saw from OP were the one questioning Mohammed's sexuality, and the one asking for your favourite N word. That shit would be right at home on the OhGee, are they the kind of threads posters want to respond to here?
I'm not too familiar with all the names listed, but innocentx left voluntarily because of lack of traffic compared to the OhGee (he posted one final thread before leaving to let us know he was sick of "propping up" this forum by posting interesting content), Galt was banned for blatant racism, and Silentsinger was banned for constantly filling threads into childish bickering if I remember correctly.
Does anyone know why Masato left TMMAC? I remember his stuff fondly from my Sherdog days.