No way does he have a promise. Too many good players up there (my preference is JJ).
I'll just say this...I don't like what he's doing. I feel like you should work out if a team that could draft you requests it. It's a sign of respect and professionalism. Also, from my point of view, it seriously reeks of desperation, and borderline makes me think that he's either lazy or has something to hide.
You guys are good with Fultz. Don't overthink it.