The Spurs would have options to get out of the money, but those options aren't free. That's why it's not a no-brainer for them to do this kind of deal. At the point where you're giving up or passing on value just to make the numbers work, you really have to question whether this trade at all makes sense for them.
Let's talk about LMA for Wiggins and the swap and DeRozan for Horford and 21 (that's the only thing that'd affect this year's cap). Here's a capulator link:
http://www.shamsports.com/capulator?...a86d9328737660
That basically has both of those trades, plus releasing Lyles and letting everyone walk -- including Poeltl. I had them select Wiseman because you suggested it, but they could easily not even have that chance or desire and would thus be more tempted to re-up Poeltl. Regardless, as it stands, they'd be about $2 Million under the tax line with three roster spots left to fill. That's basically impossible without further trades to move Gay and Mills. Even if the Spurs can find a way to make it worth without taking back future salary, they'd be right up against the tax the next season, but this time they'd have to make a decision on keeping White. You're one of the people who believes that he should get more than Murray, and that would make them clear tax-payers, and that's with them having 10 guys on the roster, including White and the future first. It'd be pretty hard for the Spurs to dodge the tax either season, and I don't see any reason why that roster would be willing to pay it.
Want and willing to aren't different. They are just different ways of describing the same thing in a case like this. GS doesn't WANT to pay tax -- therefore saving money is an incentive that has to be worked into any deal. They might ultimately decide to not do a deal, but they'd be missing out in the same way SA would be missing out if they decide not to pay the price GS asks for to move up in the draft. SA might well be "willing to" just draft at 11 -- in fact, I'm sure they are. GS doesn't have them over a barrell. Both sides want things the other has, but both can get those things by dealing with other teams. We've heard no indication that PATFO even wants to move up that high; so assuming their lack of leverage doesn't make sense. LMA for Wiggins just seems like a straight-forward framework that gets GS something they want while SA gets something they MIGHT want. I've yet to see anything about PATFO coveting Edwards or Wiseman.