Actually the real real question, can the Pats be a SB contender without any real star power on offense?
For many years it was Brady and Gronk, Edelman, Welker, Branch, and/or Moss. Can Mac be a star with no WR1 and without a real slot receiver? Brady looked close to done in 2019 throwing to a bunch of nobodies then miraculously became elite again when he was surrounded with real talent.
The Pats need to draft better, until then the coaching situation is irrelevant. If you draft foot soldiers, no amount of coaching will turn those players into generals.