The Celtics have to trade a contract without taking back salary in order to sign Hayward. Very few teams right now have the cap room to take on Crowder, Bradley or Smart. And the few who do probably would'nt be dying to give the Celtics picks back in return because the teams with space will be lottery teams. It benefits Boston to deal with Utah directly.
It's hard to believe there isnt some playoff contender out there sitting on a non-guaranteed contract and a decent draft pick who wouldnt want Crowder.