I think if we did that I would prefer to sign a young PG who can sit behind Blake and learn for a season. (Unless there is an injury) Someone who impresses in summer league and gets an invite to the fall camp.
I still don't think Mo is a good option for next year's team if they want to grow. Maybe he mentors the guys off the court, but on the court I did not see much leadership in terms of running the team. Some PG are considered the quarterback of their offense. Mo was the Qb, RB, and WR. But in all fairness that is what we needed last year.....
This year we need to get other players more involved. Can Mo play more like he did in Utah and Cleveland? If he can then maybe he would be a good asset. He would have to come in with the right mind set. Both he and Blake need to work together and understand that guys like CJ and Will need the ball too in order to develop and be ready for the playoffs.