Cousins would provide the biggest impact, and also the biggest headaches. I'd like to see Demarcus go through one season without several mental breakdowns.
But the fact is, he is the perfect center piece out there for this current Celtic team. (minus mental laps) He stretches the floor, and scores in the low post on offense, all while being a competent passer, he defends at high level, and protects the rim, and gives toughness on D.
He could be as impactful as...dare I say, Labron, if his head were screwed on right.