Per season, no. But you don't think he'd rather lock in 4/28 now then risk that he takes ten million but doesn't play as well next year or gets hurt and is one year older, trying to get another big contract? It went exactly as he and Boras planned it - play in a favorable ballpark, re-establish the potency of his bat, then go back out into free agency. Despite what you say is his established pattern, if his price doesn't get too high, I'd have no problem with the Sox re-signing him.
So long as they get kevlar vests for the left fielders.
I'm not a big fan of Beltre, and I think even 4//28 is way too much for him. Sox resign him, you get .270, 13hrs, 70rbi's. The guy's had two good years in his life, and has Boras as his agent -- think of Beltre as a poor man's Butch Hobson.