Zorbist is a switch hitter that struggles to hit .240 against righties batting from the left side.
Kapler did hit over .300 last season, so it's not like he can't hit, and hit over .270 last season against righties, so there is your platoon.
Regarding Percival, Sternberg isn't paying Percival 8 million across two years to set up Joe Nelson.
Yeah, Percival crapped the bed big time last night, and last week against Baltimore, but my guess is Maddon is probably under some pressure from GM Friedman to keep him in the closer roll for a little while longer, but there has to be a point when enough is enough, I mean the dude is 38 after all.