Barry speculated that it will be Lo Duca and that we will keep 3 catchers and use only 6 relievers.
That's not a wise move unless they are choosing to use Estrada strictly as a PH until he's 100% healthy. But there is another move on the horizon, I believe, with Mackowiak so they should call up a reliever in the meantime. Cordero will not be back anytime soon so they can't survive long with 6 relievers.