The Mavericks’ center position has turned into a roulette wheel. Spin it. Watch the ball go around. See where it lands and hope that a winning number gets called out. Rick Carlisle is the guy spinning the ball. This comes after Salah Mejri had a string of several games that were productive, including a double-double in the win at Washington. We haven’t even mentioned Nerlens Noel yet and he’s destined to get his shot at some point down the line. “It’s a bit of a by-committee position,” Carlisle said after Dwight Powell’s big night. “We had this three or four years ago when we frequently played three guys in one half. The guys got to roll with it and understand the things they do may only fit in certain stretches. We don’t have the luxury of a rotation right now in indelible ink so far. Which is OK. Sometimes that can keep a team on its toes.”