They really aren't, thats the issue. Look up the defensive ranking of the Pats, and then compare that to every other top 5 draft picking team in recent memory at least. They are a massive outlier compared to those teams that are usually at the bottom of the league in defensive and offensive ratings. The Pats aren't.
Thats the real danger here. Adding Judon and Gonzo, an offseason for Keion White...this D could be very, very special with BB at the helm. Unless Jimmy Johnson is walking through that door this team is going backwards worse than they are now. Or even worse, a treadmill team for a decade.