Well, seems my theory is right in the ballpark.
How Did Patriots’ Defense Become So Overrated Over Offseason?
"The Patriots’ defense was slightly overrated by their lack of strength of schedule, however. The Patriots’ defense actually was average last season, according to FootballOutsiders.com’s DVOA metric."
"The Patriots are being forced to start undrafted rookie defensive lineman Adam Butler, who was a summer stud but has regressed since seeing his usage expand. Fourth-round draft pick Deatrich Wise has been a nice surprise, but that he’s playing as much as he is just shows the Patriots’ lack of edge depth."