After the Leuer trade, Memphis could afford Gay, they just (smartly) realized that given the deal on the table, Gay was ultra expendable. Remove him from NBA 2k and Gay is not that spectacular, he's an inefficient 16-17 ppg guy. That's fine and all, but he's not a star, he's far from it.
The new management group, who has been hiring a number of higher level, statistical basketball guys targeted Gay as pretty expendable right away. He runs a lot of ISOs, slows the offense and doesn't do it efficiently. I still think Gay is a good player, but he's the prototypical 2nd guy on a good team.
Memphis won the trade hands down, Davis is really solid, they get some salary cap relief and get an okay player in Prince. Detroit gets an expiring Calderon contract and he very well may push them into the 8th seed if that's what they are going for.
Toronto gets the luxury...of paying the luxury tax for a core made up of Rudy Gay, Bags and DeRozan, so there we go. Pretty much every player on their team is locked up for years now, so THESE are your Raptors.