I think you need to start the season with Buck, and this isn't about delaying arbitration or anything like it. It's just that Buck knows the intricacies of the position, especially defensively. There's huge upside with d'A offensively but there's more to catching than that, as we all know.
Unless d'A tears it up in ST and appears to grasp those intricacies I mentioned, he's got to remain in the minors until he isn't going to be more of a liability than asset.