You can't separate Belichick from the Patriots defense; they go hand in hand. Belichick also won two SBs as a DC. And of course, BB has everything to do with the success of the Patriots as an organization from top to bottom. I don't get where you're going there.
Here are the years BB has won the SB and his defensive ranking by points allowed:
'86 - #2
'90 - #1
'01 - #6
'03 - #1
'04 - #2
'14 - #8
'16 - #1
This isn't too hard to figure out. The year they had there lowest ranking in '14 has been the year that has been discussed when they gave up 33 pts to us in the opener and 41 pts to the Chiefs in week 4. Beyond that, Belichick's defenses have been absolutely superb and the main reason he has 7 championships.