And according to the Fangraphs framing numbers, Zaun was pretty good in that area. They only go back to 2008 though, so if you assume he had similar skills in his younger years, he put up a lot more value than his current WAR total. In the ~1500 innings where his framing was measured by Fangraphs he was worth +38 runs. Just to put a playing time frame of reference to that inning amount, Danny Jansen has caught 793 innings this year.