Nava Optioned to Pawtucket to make way for Hermida

According to the Globe's Amalie Benjamin, Daniel Nava has been optioned back down to Pawtucket to make room for Jeremy Hermida's expected callup tomorrow.  Apparently the Sox have decided that the struggling roster would be better off replacing a switch-hitting left fielder who has been doing great at the plate with a lefty who can't field or hit well.  There are a few good reasons to do this, but I know who I'd rather have in Boston...