I think it's less about McDermott's scheme "neutering" a great player, and more that he doesn't scheme up anything particularly impressive.
Belichick got 10+ sack seasons out of such vaunted names as Marc Anderson and Tulla Banta-Cain. Maybe it's not fair to compare McD to one of the best defensive minds of all time, but do you really think he hasn't left at least something on the table with the talent he's had to work with?
Does Belichick get 10+ sacks out of Rousseau? Does Spags? Rousseau might not ever be a world beater but if its possible for a coordinator in this league to scheme up pressure from Tulla Banta-Cain, it's fair to wonder out loud if McDermott just isn't that great at min/max'ing our pass rush talent.
And if we drop someone like Maxx Crosby on this team and the pass rush improves, does McDermott deserve credit for that? Or are you saying there's just nothing these coordinators can do? I'm honestly asking, cuz if that's the case then we should almost never be questioning scheme, we should only be questioning the talent... right?