The Phillies need someone who can provide veteran leadership to their extremely young team. Someone the young guys can look to when times get tough, and know that the player has been there before.
They’ll also need a left-handed hitter because ideally you’d want a platoon player sitting on the bench as not only the back up to Joseph, but someone who can pinch hit in the right situation.
Most likely you’d want that player to have some pop as well. It’s wise to at least have the illusion that your left-handed bat off the bench could score you a few quick runs with one swing of the bat.