Doesn't really change my point. One player lost, replacement at another position.
In 2016, at safety, the Pats had McCourty, Chung and Harmon. No, Harmon was NOT a sub/relief man for either McCourty or Chung, he was the "nickel safety", coming on
in addition to the other two.
Behind those three, they had Richards, Ebner and King - all of them high-value special teamers and, supposedly, injury backups for the "starting" trio. IMHO, the Pats were lucky not to have any injuries at safety.
Sure, you can just arbitrarily dump Richards, but you still have to replace him with someone else who could be a legitimate injury replacement for one of the starters, because it sure ain't gonna be Ebner or King. Your choices then are UDFA rookies Thompson, Travis or David Jones. Do we know for a fact that any of them are "better" than Richards?
+++++++++++++++++++++++++++++
At DE, in 2016, the Pats had Flowers, Long, Sheard and Nink. They have only Flowers left from that group. They've added Guy (more of a 3-4 DE/4-3 DT hybrid), Rivers (a rookie DE/OLB hybrid - probably) and Wise (a rookie). Ealy and Grissom are the only other DEs on the roster with NFL experience, and Grissom was exclusively a special teamer in 2016 (though a high-value one). After Ealy and Grissom, you have only two UDFA rookies: Kidder and the just-arrived Keionta Davis.
Arbitrarily cut Ealy to keep Carr, and your potential injury replacements are a special-teamer OR a UDFA rookie. Beyond that, you're counting on significant contributions from some of the LBs, including Hightower, McLellin, Rivers and (possibly) Langi. And what does that do to the LB scheme?
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In 2016, the Pats had Butler, Ryan, Rowe, and Coleman who all played significant defensive snaps (though Coleman ultimatey lost his "nickel corner" job to Rowe). Behind them, they had Cy Jones and Jon Jones. Of the three "backups", Jon Jones played the fewest defensive snaps by far (only 64) and the most ST snaps by a factor of 5+ (307 to 51 and 65).
The Pats replaced Ryan with Gilmore. Coleman, though pretty clearly limited, has significant game experience (but virtually zero ST value). Jon Jones may or may not have progressed beyond Coleman's level (in the eyes of the coaches).
Hypothetically, you could maybe get away with cutting Cy Jones and replacing him with Carr instead of, say, Moore, but that's still risky.