Of course you need some vets, but you also have to account for some other things. Belichick also jettisoned some real talented players who didn't fit his with what he was trying to do, whether that was Greg Spires, Terry Glenn, Lawyer Milloy, Damien Woody, Tebucky Jones.
My concern is that, unless it's a guy who wants a 3-4, with few LBs on the field, a lot of players aren't going to fit. Godchaux won't. Guy, Jennings, Wise, Keion White. These guys are protoypical 3-4 DEs (maybe White can play DT but his speed is wasted there). Tavai and Bentley are useless because they can't cover. Peppers may be useless too.
This is the problem. Dugger can play anywhere but I wouldn't trust him to play cover-2.