just a bit of defense for Lobi - a lot of the starters are used to throwing to him and like him.
edit - where's a good set of stats on W/L and era for catchers games started? also how pitchers do with various catchers? By rep, Wieters is a great game caller but I don't know about Lobi. I don't want to lobby to much for jose without the data.
Any measure of a catcher's defense, aside from pop time, is purely qualitative. There are too many variables at play to look at stats such as catcher ERA.