Marinelli is in charge of the Dline. The DTs are overachievers they are quick but not strong. The DT are just not good enough in a playoff setting. The Cowboys have known this or should have known that you cannot pick up undersized DTs and expect to dominate, at best they were getting by. You need to apply resources to that position.
Marinelli has refused since he joined the Cowboys to improving the DTs. Insisting that he wants rushmen at those positions. Unfortunately, the type of DTs that he wants cannot control the line of scrimmage against playoff caliber offensive lines. This not something that was unknown to the Cowboys front office.
There have been a vocal minority on this board that has posted about the DT position for years and insisted that the DT position is a liability and I think that the DT position as constructed right now is not playoff worthy.
I don't know if Marinelli should be fired, but he is the reason that the DT position has failed he needs to take a large share of the blame for this playoff loss.
The DT position needs to be upgraded.