I mean, the max QO is for the most he could possibly get. So I think he'd be hard pressed to call it a low-ball offer. You can't really offer incentives on a max deal, anyway. Though 2016 will be interesting, because it will be the first year in a long time that the max starts growing faster than 7.5 percent. So a Kawhi will actually be making less than max money for the whole deal, which means that incentives and trade kickers will actually matter.
In any event, if the Spurs and Kawhi decide the part ways, the Spurs can always retract the mQO and let Kawhi sign whatever deal he wants. But I'm not going to pretend that Kawhi would be wronged if the Spurs offer him a full max deal and he wants a shorter one.