What can you really get for a RFA in a S+T? Seems like teams are rarely interested in giving up anything of significance in that situation.
Depending on what Sully is getting paid by his new team, I think a large trade exception would be sufficient for Ainge. If he gets the $18 million that some posters think he could, that's enough to fit Jimmy Butler in as a trade deadline acquisition, which means we wouldn't have to try to match salaries. It'd also be more than enough for targets like Hayward and Cousins.
By rule he'd have to get something in addition to the trade exception, but a rather protected second-round pick might be okay.