For what it’s worth, in stories over the years, BB reportedly views how he leaves the Pats after he leaves as much a part of his legacy as what they do over the years he’s there. Supposedly its one of his goals to leave the team in great position to keep rolling without him.
That sounds great to say but obviously we all have egos so now that the end is actually coming up for him he might shift to what you’re saying and blow his load for another ring. But at least over the years it’s been reported that he isn’t inclined to do so. Not extending himself to keep Brady’s window open with the team is at least one indication though he’s staying true to that. They could have gone New Orleans or Pittsburgh style and kept kicking the can down the line if he really wanted to. Coming off the STL super bowl Brady wanted a multi year extension.