Vas’s defense is decent, but IMO his game management is not; his pitch selections are somewhat predictable (I realize most are called from the bench). There are times a catcher has to go out and get on a pitcher. He has never done this, even before the mound visit limits. Leon would go out when needed, Vaz won’t.
His hitting is always going to be sporadic but I can live with that from a catcher.
He’s okay to keep, but he’s not a guy you build around, ergo, not a core guy.