mazza's a strong fucker. he's done over 600 in competition in the 165s. shirt or not, that requires a shit ton of strength.
people keep acting like the shirt "gives" you all this weight, but it sure as hell doesn't. he wears the same shirt i do, an inzer rage-x (though his is probably modified a bit, but then so is mine). yet somehow i get less than 90 pounds out of it and he gets about 200.
what does that tell you? it tells me that he has an INCREDIBLY strong lockout, aside from much better form. if he and i both had the same raw bench but he's got a much stronger shirted bench, we could both have the same shirt, he's simply STRONGER. period.