I think someone will offer him more than they are willing to spend. I guess the anticipation is that they can find someone to deliver a sizeable percentage of what Grant does for a lot less money. Not sure I agree. But this is the type of situation where your GM earns his money. And I trust Brad.
Yeah, that's just life with a team that is well in the tax - You have to make tough decisions. I'd imagine they'd be willing to up to maybe $14M/yr, but not into upper-teens territory. If their hand is forced and they think they can get somebody with the Taxpayer MLE that can do 80% of what Grant can do, then they will probably let him walk.
I really like Grant and love the personality he brings to the team. His improvements have also been impressive and unexpected. But the NBA is also based on potential/ceiling and Grant is definitely limited there. It really depends on what a team with cap space thinks of him and where they see him in their hierarchy. Grant performs extremely well on a team full of capable star-level players, but what if he is being asked to do too much?
Fwiw, Marcus is a considerably better player than Grant and DWhite is somewhat overpaid. But I would say Grant and DWhite are comparable players in terms of impact.