Bill's mistake was not giving Brady the proper credit after their last SB win.
It was a low scoring game, but the Pats just got lazy on how clutch/driven Brady was.
Bill isn't some genius batting 1.00 and he shouldn't have full control of GM duties. Outside of the Cowboys/Saints beatdowns he did have a respectable defense. Just that the offense was neglected for far too long as there was major regression by Mac Jones.
My only concern with Bill would be who his OC would be. Defensively, I would feel at ease with Bill game planning with Parsons, Diggs, Bland, and Law as the "core".