and if Garrett recovers, I could see Garrett in one corner, Thomas in the other, and Young as the CF starter. Blankenhorn is not a bad backup as that is a righty-heavy line up. Alu also I think is in the team plans, although I don't know where. Who is injured coming out of spring matters.
As for Robles, if his back is sound, and that is a big if, he's relatively cheap for a starter in CF, especially if they decide not to pay for a free agent.