If Newton is healthy and listens to Darth Bill, I think it is actually a good fit. Newton always did his best when he had a decent defense paired with him. Also, outside of Tom sneaking it, the Pats have not had a mobile QB capable of scrambling for a first in forever.
As for the Bucs, motivation is a big part of team success and chemistry. If they can buy into the bullshit that Old Man Brady and Gronk mean they are winners, then they just might be winners particularly in that shit division. The only reason the Saints look so amazing is they were in that division and unlike the Pats tended to brainfart when playing other teams outside of it. But I think more depends on Gronk than Brady. Brady simply not throwing 30 picks will immediately improve things, but he needs a healthy Gronk to get out of trouble. And Gronk is generally only healthy about half the time. I agree healthy Gronk is the best TE of all time, but Tony Gonzolez is the GOAT simply because he almost never got hurt and you could count on him to be there every game.