You can see why the Patriots are great and the mentality they have. Yeah they are probably the best team in the league and coming off a win but Brady is looking at the big picture down the road. The subpar offense they have now could be exposed in the playoffs and he knows it.
Compare that to the Cowboys' mentality after some underwhelming performances and losses "Relax, everything is fine...let's win the division and then see what happens in the playoffs where anything can happen." If there is any team that can get away with having that mentality, it's the Pats but even they are focused on trying to improve their weaknesses now.