The Spurs use this creative manipulation of the rookie salary scale protocol all the time. In fact, they're worse for it; there were no incentives that George Hill could meet in order to get his 120%. He was getting only 80% regardless (and since 80% of the third year of George Hill's rookie contract actually worked out to less than the minimum salary, he had to be bumped up to that by the league instead.) The Spurs knew what they were doing here, just as they did when they did it to Anderson last week. The only people who didn't know were the fans, and that's because no one sought to tell them.
When San Antonio do it, it's "shrewd." When Memphis do it, it is "cheap," and representative of a moribund franchise that needs contracting. This is the prevailing at ude born out of a desire to disparage the Grizzlies at every juncture, symptomatic of a wider problem of favouritism for certain executives by certain media. For example; Daryl Morey is a vastly superior general manager to David Kahn, but why did the very similar mistake signings of Ryan Hollins and David Andersen, and their subsequent correcting trades, get different levels of press? Because Morey is good and Kahn is bad, thus Morey's mistakes are all minor while Kahn's are all major. There's an element of truth to that logic, yet it is all overblown.
The same is true of the Spurs' and Grizzlies' handling of this year's first round draft picks. If it's wrong when Memphis do it, it's wrong when San Antonio do it. And since it's not wrong when San Antonio do it, it's not wrong when Memphis do it either. It's not going to be wrong when any team does it. Perhaps more of them should.