If you haven't noticed, he's been playing 1B a lot, because Zito needs Hector.
And Bochy said Hector will catch Madbum also he wants him to catch both lefty's because there so radical and gives him instant experence behind the dish,, and it gives Posey time at 1b and more time for Belt perhaps because Posey at 1b is not really a day off so to speak..