I still think that the Jazz are in a strong position here. Boston has to get rid of a lot of guys. They get under the cap enough to actually sign Gordon. He already took a pay reduction to go to Boston so I can't imagine he wants to haggle at this point.
The issue here is straightforward. Can the Celtics trade Crowder, smart, and bradley to another team for cap space AND get something in return more than a 2nd round pick or not? I don't know what team would do that besides the Nets who would also have to cut players currently on their roster and pay them. So, I doubt that the Celtics have many options other than just tearing up 7 player's contracts and paying for them themselves above and beyond trading for a second round pick.
I don't know why you think they need to move all three. They don't. One will suffice.