As much as I like the idea of grabbing them both, there is absolutely no denying they did fall into his lap. It's not often you lose a player for the bulk if not the entire year, and then someone DFAs a player at that same position who was an All Star two years ago and is on a very cheap contract.
I still think Cooper can take over that position, as he at least has a better track record of success against MLB pitching, but he is not going to make anyone decide Casas is expendable...