Funny thing is, results disagree with you.
Moss's departure changed their style of play. You were right about that at least, they certainly aren't the same as they were with him here. With him here they were geared up as a quick, explosive offense looking for quick possessions, big gains. With him gone we play underneath, go for YAC, run the clock and have to play smarter football to succeed.
Where you miss the boat is, Bill Belichick and Tom Brady are both perfectly positioned to play the style we have to play without Moss. Gronkowski, Hernandez and Woodhead probably don't play the same roles if Moss is here, and collectively that's as big a loss as he was a gain. Those three have been key to what we've done in the post-Moss era and they don't get the ball if he's here doin his thing.
The other point you're missing is that the style the team is playing now is anathema to a Moss. It's not a fit with what he's out there to be. He's an explosion/quick possession offensive player who gets the ball all the time, the entire rest of the team is built around time of possession and a steady progression downfield and having a number of targets. Having him here when he'd declined enough that the time came to get back to playing Patriots football again was always going to be a chemistry issue because no way was he going to keep getting the ball thrown to him as much as it had been.
Finally, Patriots style football was what we needed to get back to for the sake of our young, developing D. Moss's style calls for quick possessions, one of the things that means is the D is on the field a fair bit. Our D is too inexperienced to have a lot of success that way. You need tough veteran D to succeed in Moss's style, that can eat a ton of minutes without hurting the team, that's not what we have. Hasn't been since 07.
We needed to limit time of possession by the opponent, that meant plating a style of football Moss would never accept. You could see it even while we were still here, Belichick was trying to control time of possession and shelter the D, and Moss wanted the ball and wanted to go get a touchdown. It was a problem that wasn't going to get better this year. We do have one of the, if not the youngest defense corps in the league after all.
I just think on the whole, just assuming that adding Moss adds offense without taking anything else away, is such a shallow analysis that it fails the "think about it for a minute, then post" test. You change your whole style to accomodate a guy like Moss. That's what "game changing wide reciever" means. And that also means you change your whole style to compensate for the lack of a guy like Moss. You really think that keeping Moss, that the only thing that would be different is a few more touchdowns? When the Patriots over the last 9 games have played a radically different style of football that has no room for a player like that? Seriously?
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Seriously?