I enjoy reading your posts and you seem like a great guy, but you have now taken over the title for "fantasy trade king" from DW Toys (another good guy, although one with some fantastical proposals).
There's no reason in the world to believe that a guy who led the league in RB touchdowns (11), caught 73 balls out of the backfield, AND ran for 1,000+ yards is going to be traded on a cheap, productive, rookie contract that has another full two years left on it.
To take it one step further, what would it take for ATL to even consider it? Definitely a first rounder, and likely a first rounder PLUS a player, and/or mid-low round draft pick. Devonte Freeman is one of the top up and coming young RBs in the entire league. There's little incentive for either Belichick or Atlanta to make this deal due to the specifics.