My guess is Tucker.
Running up to the deadline, prevailing thought was he'd cost a first. That's exactly the kind of thing Ainge might be looking for, a nice win-now move to bring in a vet that doesn't cost any BK picks.
The fact that Ryan Mac took Sully and two seconds instead baffles me. Must still be sore over the IT trade & worried about his job being questioned as a 'double agent' of sorts for the C's. That guy has really been bad for Phx, with this rudderless ship approach.