As for the Supermax, it just doesn't make any sense to come with that offer right now. Think about it: the Spurs have refused to rule him out for the season 24 hours before the start of the playoffs; they are seemingly convinced that it's up to him to "feel ready to play", which he apparently can't or won't.
What follows from there should be to allow him few extra months to finally "feel ready to play" until their next meetup. If he or his camp agitate for the DPE before the former condition is met, then you start to listen on him very seriously because the jig is up right there.