I didn't read the whole thread. Sorry, I'm just sick of all the Monday morning quarterbacking, and bellyaching too, so maybe the following has already been pointed out.
It is not true that C's had zero leverage. Ainge did not have to trade Bradley alone. This was NOT like the Paul George situation at all. He shopped AB, Smart and Crowder. He had the flexibility to listen to other teams about any of those guys. Now obviously the parameters would have been different in each case, but he did not have to trade Bradley specifically. Also, it is false to assume that Crowder, for example, had no value around the league, I've heard that stated too, and it is simply not correct. So, there's more leverage. Furthermore, he only needed 2 teams to be interested in any particular guy to create additional bargaining power. The fact that the trade came on the first day of open trading was more driven by the desire to close out the Hayward signing, not because he was up against a wall.