If Fleury has a good first half, I could see Grandal on the block at the deadline. Mesoraco/Fleury might make a pretty good tandem down the road after Hanigan leaves.
I think one possible path might be Mesoraco upgrades from Ramon (a lot), Fleury replaces Hanigan as Hanigan gets pricey. Grandal in a package for an impact guy. Barnhardt is a wild card. I like the future at catcher about as much as any spot other than RF (or 1B if they can keep Votto around).