The Marlins signed infielder Jose Castillo yesterday. Castillo turns 27 in March. The Fish are slotting him into their third base vacancy, though second base with an accompanying Dan Uggla shift is a possibility.
I took an in-depth look at Castillo here. I believe skipping Triple A threw off his development; a return to that level might be wise. Castillo currently doesn’t have the bat of an average second baseman, so he’s definitely not worthy of the hot corner.