I've read any number of things saying NBA insiders didn't think Fournier would not get as much money as he was making on his old contract.
As far as the money and the TPE go, you don't worry about sunk costs. IOW, if you don't think he's worth 4/80, you don't pay it just because you used the TPE. He certainly didn't earn it with his play here, and if you're looking to play for a contender, you don't play for James Dolan.