I think a bigger point here is that because there are not that many high caliber FAs next summer, the FAs that do hit the market are going to command a huge amount of money. In other words, FAs like Tyler Zeller will command $10M per year, for example. It is going to make the contracts of Crowder, Bradley, Thomas seem like good bargains.
In any case, while the Cs may or may not be a destination, keep in mind that Danny Ainge has done a nice job of creating flexibility, so that the Cs can do something if the opportunity arises.