I don't think you realize that there are other factors to be considered, aside from QB play, when trying to start from scratch (that's what they are doing) the offensive side of the ball.
It is pretty clear from multiple reports, each with multiple sources, that there was major dysfunction on the O side of the ball, going back years. Ground zero of that dysfunction was Mac Jones.
Or do you believe Devin McCourty is one of the message board fans of the patriots, because that's exactly what he is recommending. You know, the 13-year DB veteran of the Patriots, who just happened to be there during the Patricia/OC time, and keeps in touch w/ his good friends Slatter and Andrews on what happened this season.