I think you're going to see Sasa playing and Arroyo sitting. With that being said, both will be given minutes down the stretch as Doc tries to figure out which will be getting the important minutes in the playoffs.
IMO, when it comes playoff time, I like the size and D (if he plays to his old form) of Sasa over Arroyo with West as the second PG. Sasa can hit threes and Arroyo has hit nothing, and on D Sasa can cover 2/3 positions, instead of just PG, shifting West to the 2 on D.