I am going to attempt to compare the two players, using Kurt Suzuki as our baseline. He is the starting catcher right now and as I look into our system, I don’t see anyone who will likely be meaningfully better than him.
Last year Suzuki had 470 AB with an OPS of .610 (which is actually better than his 2016 thus far). He had 136 total bases and 29 BB’s, so I am using a number of 165. He hit .240.
I will use an offensive comp of Christian Yelich. He had 476 AB with an OPS of .782 in 2015. 198 TB and 47 BB’s (245 total). He hit .300 and was on base 36.6% of the time.
So the offensive edge would be 80 additional bases a year. 25% more hits, i.e. increase in times advancing or driving in runners as well as being knocked in himself. Yelich did score 27 more runs (although I get that is dependent upon other people). The 63 he put up actually seems pretty low given his offensive numbers. He scored 93 times in 2014 with a lower OPS albeit 90 more AB’s.
That seems like a really huge increase in offense. An edge in pitch framing, “managing the pitchers”, throwing out runners, and passed balls would seem very difficult to prove out an offset to the offensive numbers. Especially when the incumbent is not particularly good at a few of these things to begin with.
All I would simply ask out of the Twins is running some similar and obviously more detailed analysis. For all I know Goin’s team has, but then I would ask that the FO actually read and consider it. The A's likely figured that out with Vogt, he had an OPS of .783 last year and over 440 AB's was worth 3.1 wins offensively.