Regarding Ricamora, my guess is that he IS still filming HOW TO GET AWAY WITH MURDER and that's what accounts for having a standby who's not otherwise in the show. They know that the standby is going to be going on fairly regularly and there's no sense in disrupting the ensemble every time Ricamora needs to head to LA for filming.
HTGAWM doesn't do as many episodes as many network series do, but Ricamora's role has grown so that he's just as prominent as any of the other leads on the show (excepting Viola Davis). He's filming more than a couple of scenes in every episode. He'll probably be doing double duty at least through the end of the year, I would think.
Luckily for SOFT POWER, HTGAWM is currently in its final season, so by the time that SOFT POWER moves to Broadway, Ricamora will be all theirs eight performances a week...unless some very smart Hollywood type offers him a lead on another show, of course. :)