The organization doesn't put much emphasis on big guys who only take on double teams. Mazi wasn't drafted because he was awesome against the run. He was drafted because he was a big body projected to help anchor the middle but had freak athleticism which is why they ended up using him at 3T more than as a pure NT. Jerry wants guys who get after the QB, which is one reason why the Cowboys are always doing line games (twists, stunts, etc) and leaving gaps exposed in order to generate pressure. If they would just draft 1 guy who was awesome at stuffing the run early, late 1st or second you'd see this DLine really keep things going especially late in the season.