I put this in the other forum regarding possible landing spots for Brady in 2023...
23% starting for Las Vegas
22% starting for San Francisco
20% returning to Tampa Bay
13% starting for Tennessee
12% retiring
5% returning to New England
3% starting for New Orleans
2% starting for Detroit
LeBron did return to Cleveland after that once seemed impossible. Drawbacks from Brady's point of view would be returning to NE weather, the changes to the offense (including the impossible to imagine collaboration of Brady and Patricia), and the distance it would put between Brady and his kids (fresh off the divorce).
My preference is Brady going to SF because he could win another Super Bowl there for sure. And right away. But returning to NE would be the most fun and the hype would be unprecedented. The team, the locker room, ownership, the fans, the media... everyone should love the idea.