Well, it obviously comes down to the guys we trust.
No disrespect to Marinelli overall as a D.C., but what pass pressure has Marinelli brought since he has been here?
Callahan produced an absolutely dominant line.
Well Callahan produced an absolutely dominant line when he was given dominant players. That's no slight to him, as he was a phenomenal coach.
Marinelli, and for the record I am not a fan of him as a DC, has mostly been given table scraps to build a DL with. Callahan had three first round picks to work with. Look at what Marinelli has had at DL:
Lawrence - 2nd rd pick
Irving - cast off from KC
Thornton - UDFA signed from Philly
Mayowa - cast off from Oakland
Collins - 3rd round pick
Crawford - 2nd round pick
He's not exactly had the same type of talent to work with as Callahan. Charlton seems to be a guy he liked so this is now on him. But I see no reason to write Charlton off at this point because people think Marinelli is some over the hill guy who doesn't know good DL because he hasn't turned some of the slop he's had at DL into Grade A prime beef.