System matters, but at the core of it, next season's system, whatever it is, is going to be even better for Mintz than last year.
Last year, with Girard and Edwards top returning players, JB gave Girard far too much time as lead guard. Mintz gradually grew into the role and was definitely ball dominant later in the year as his confidence, and the confidence JB had in him, grew.
This year, Mintz will be The Man from the first possession, and he'll know it.
Except for blowouts and rare mismatches where it makes sense for another player to start the offense, Mintz is going to be possessing the ball every meaningful possession.