Doubt it. I mean, he could be promised, sure. But I don't think they're related. Marcus Smart could also be promised, or be heavily talked about, but they're not sitting him.
The only thing that matters about the CBA with regard to his situation is this:
1) Draftees cannot be traded for 1 month after they sign their rookie contract.
2) Draftees are the only players who can sign contracts during the July moratorium (some have already signed).
3) Neither Smart nor Young have signed a contract, meaning that Ainge is preserving the right to trade either or both in July.
