He really needs R1 squad. I was very dubious on investing in him, but @scuba convinced me, and frankly, he's a workhorse.
With Cas Maul is not a problem as K2 and Baze will both start with Ten up, he covers for everone while Cas starts doling out debuffs and buff immunity.
Without that early Ten Up though (and the bonus attacks for and with Cas) I can't see him doing much. Doesn't seem like a good fit for droid team.