Re: Should we trade Mes & keep Grandal?
To the original question.... absolutely not. Mesoraco is a potential .850+ OPS bat at catcher with potential above average defense. Grandal isn't either of those things. To compare their sheer tools against the other, Mesoraco has the better hit tool, Mesoraco has the better power, Mesoraco is the better thrower, Mesoraco is the better defender and Mesoraco has better speed, though it doesn't matter at all since they play catcher. Athletically, Mesoraco is a little better. When it comes to plate discipline, I think Mesoraco is more advanced there now, but its probably pretty close in the future.
In short, Mesoraco is on a completely different level than Grandal is. In my opinion, Grandal's ceiling is probably pretty close to what Mesoraco is today.
Grandal doesn't have the bat to play at first base, so for anyone thinking about that.... I would think again. With that said, Mesoraco could have the bat to play at first, so that could be a way to keep both 2-3 years down the road if you want to do something else with Alonso, but you had better be really sure about Grandal and Mesoraco to make that plan.