What are the consequences of that hypothesis?
I'm trying to come up with a way out of the Mac sucks/does not suck binary. I mean, I don't think parsing every play in order to pin the blame on Mac, the WR, OL, BoB's play design or Belichick's roster construction is an edifying strategy.
Why repeatedly run up the gut on 2nd and 1? Why not take a shot? Why all the passes behind the line of scrimmage? Why the endless screens and the lack of play action (which is criminal)? Why is it that Mac can have some success each week, make a bunch of good throws, a handful of great plays, put up decent numbers, and yet our offense is still largely ineffective?
Maybe it is the OL. They're terrible. And the WRs/TEs are below average. Mac is far from the only problem we have, but he's limited, and when the guy who handles the ball on every play isn't elusive in the pocket, can't threaten the defense with his feet, can't zip the ball unless the pocket is clean, isn't disciplined enough to set his feet consistently even when he has the opportunity to do so, regularly fails to spot open receivers, doesn't have the arm talent to attack all areas of the field, and makes the occasional bafflingly dumb throw ... your offense will be relatively easy to defend. And that's our offense. Teams are stacking the box, giving us all the easy shit underneath, and making us drive the field because they know we can't do it without shooting ourselves in the foot.
Note that most of the criticisms cited above have nothing to do with Mac's supporting cast.
(But maybe this is just a thinly veiled way of saying Mac sucks, which I think he mostly does. So I'll own that.)