I don't get why people keep thinking Green's price tag will affect him being back. Really, the only number that matters is his cap hold. So the Spurs have to make a decision on whether to bring him back or not regardless of contract. Also, the Spurs are a team that's more likely to re-sign their own guys and then try to figure out how to bring in outside players, which is why they were willing to give Tony a max extension instead of seeing what free agency holds.
The Spurs aren't letting Green go for Aldridge, not when Diaw and/or Mills can be dumped for free or even for a return in assets. If the Spurs want LA, it'll be so they can have the most balanced SL in the league, not so they can lose four of their top six perimeter players in one off-season.