He's out because Ray is back and Avery Bradely has played too well to cut his minutes below 25-30 MPG.
Doc's cut his rotation down to a more traditional 8 man rotation for the stretch run it seems.
Rajon, Avery, Paul, Bradon, Kevin starting
Greg, Ray, Sasha off the bench
I imagine Pietrus if he can get back will take Sasha's minutes and probably some of Ray's and Avery's.