He did not play well and even if he did or does in the next 2 preseason games against scrubs(which he should) he will then go back to the bench and watch Dak play.
So next year he will be a 25 year old FA who still desperately lacks playing experience to develop. Who and when is going to give him that opportunity to play?
However, if he shows clear improvement, then it will bode well that he could potentially be a good backup and with more upside and a better trajectory than the current backup. He will get more reps if he’s the backup. He won’t, to your point, if he’s dead weight behind Rush.
If he likes the system, and the coaches like him, then he’d be back.. if he shows clear improvement.
If I had to predict, I’d say he’ll play better but not enough to be confident in him. I will still watch it play out and judge after seeing a bit more though.