Pro #2: Extra ball-handling
This is a direct contradiction of the previous point, but it also makes some sense for the Dallas Mavericks, as having extra ball-handlers on the roster has proven to be useful in the past.
Whether it be Jalen Brunson, Spencer Dinwiddie, or Kyrie Irving, the Mavericks have found success with Luka Doncic when they put a ball-handler next to him on the court/on the roster.
While adding Chris Paul would create a glutton of point guards, it would also give the Mavericks an extra player who is capable of running the offense.
In all likelihood, when one of Doncic or Irving is off the court, the other will be on the floor for Dallas. So, having Paul on the roster would give them a guy who could share the floor with either and take some of the pressure off of them.
Paul would be able to lead the way on offense when Doncic gets forced off the ball, and the same goes for Irving. His presence would allow Jason Kidd to test out different lineups without worrying about not having enough creation on the floor.
Again, the roster fit may not be super ideal, but with how much success the Mavericks have had putting ball handling next to Doncic in the past, it would be nice to have more of it on the roster.