FA: D'Angelo Russell Comes to Dallas | 2yrs/12mil

[F Gump]

As a restricted free agent, Philly has some control over the situation, especially given the lack of cap space out there.  They may get an asset in a S&T or they may sign him to roughly MLE because he can't get more elsewhere.  So it might have been Caleb vs air and a couple of seconds, or it may have been Caleb vs Grimes + using that second to get off some salary and trade for a PG.

Yep, because their cap payroll is lower than DAL's, PHI has multiple useful avenues with QG using the RFA situation that were not really available to the Mavs if they had kept QG. It is what it is and its one consequence of having a good chunk of useless salary cluttering your cap.