Part of Landry's flex defense involved D-linemen recognizing certain keys and acting accordingly. It sometimes appeared as though the DT's were hesitant. However, unlike the DE's, they had to proceed with a level of caution, ensuring that they didn't overrun a running play.
Perhaps this is also true for the position that Mazi plays. It is just speculation on my part, but I don't think he can just pin his ears back and go for it.
Agreed, this is what I wrote in a another Mazi thread -
To be fair, I don't think he's that kinda player. Gotta take into consideration what Quinns system asks from a NT.
Take Marinelli - he liked smaller quick guys to shoot gaps - one gap responsibilities - thats why is you notice he always had NT/DTs that had high sack numbers for that position, Henry Melton, Warren Sapp, Ratliff and Hatcher.
Look at Sapp - great sack numbers when he was with TB, he signs with Oakland and his numbers aren't the same - they asked him about that, he said that its a different system - he had 2 gap responsibilities - by the 3rd year in Oak must have changed the system cause his sack number jumped up to 10.
Now Quinn seems to like the Big Guy - hence Hankins and Mazi. If Marinelli was still here he probably doesn't get either player.