The Patriots will be a very interesting team to watch this year. With the Colts having Philip Rivers as their new QB, it's possible they could look to move Jacoby Brissett. He was a former Patriot who Bill might want back. I don't think he's a longterm solution anyplace though.
Tanking to get a superstar QB isn't unheard of. But maybe Belichick truly believes Stidham can get them back into contention. My suspicion is Bill has two plans. Plan A is to try to win like the Titans did last year with a solid defense and a strong running game. The Titans knocked the Patriots out of the playoffs playing that style of football and most coaches say the last game is the one they remember the most. He's a defensive-minded coach and defensive-minded coaches tend to prefer that approach to offense.
Plan B would be to tank if the Patriots can't win games using that style of football. That would let them get a star QB to replace Brady and play a more modern style of football with more passing in the future.
Teams like the Chiefs are built on speed and down the field passing with the run game mixed in. Teams like the Titans want to take the ball out of the QB's hands and rely on a back.
Defensive-minded head coaches typically want to avoid bad situations. If they have a running back who can average 3.5 yards per carry, they'll just feed him the ball nonstop rather than risk passing the ball. Bad things can happen when you try to pass. The QB can be sacked or injured. Offensive linemen can get penalized for holding, hands to the face, or tripping. The pass can be tipped or intercepted. The receiver can drop the ball (especially if he's an Eagle.) To a defensive-minded head coach, the passing game is rife with disastrous possibilities while the running game is much more under control. If they have to punt, okay they'll punt and count on the defense to hold the other guys. It's the lowest risk option for them.
Offensive-minded tend to look at the passing game as a more efficient way to attack a defense. Receivers are often faster than the defensive backs and the receivers know where they're going while the defenders have to read and react. Offensive-minded coaches want those big chunks of yards. Sure, there's a bit more risk, but the rewards are greater also. A bomb's away offense can put up thirty or forty points a game and force the opposing team to try and keep up with them while a run-first team might average 17-21 points per game. If you can put up 40 points a game and the other team can only put up 21, you're going to win a lot of games.
The Patriots with Brady, Gronk, Edelman, and others were a very dangerous passing team. I don't think they're going to be as dangerous a passing team this year. I think they'll try to win by running and if that fails, tank to get a star QB for next year and beyond. They'll be a fun team to watch. How they start in those first four games (Dolphins, Seahawks, Raiders, Chiefs) will likely tell us a lot. Three of their first four games (Chiefs, Raiders, Seahawks) could easily be losses. Their first game is against the Dolphins. If they lose all four of those games, they're tanking. If they go 1-3, they're tanking. If they go 3-1 or 4-0 forget tanking. If they go 2-2, well they're in no man's land and could go either way. They'll be a fun team to watch.
If they try to tank, can Belichick force himself to lose games? Even knowing that losing is better for the team, can he let his team lose? It'll be interesting to see how it all plays out.
Fly!!! Eagles!!! Fly!!!