Codswallop, K.  Yes, back-up catchers are back-ups for a reason--they aren't much good, especially with the stick.  

But, c'mon, everybody knew how old Russell Martin was, and that there was a pretty good chance he'd need lots of time off or would be on the DL for long stretches, it just goes with the territory.  

So management's responsibility was to have a back-up ready, and they whiffed on that 1, eh, by a mile...

As you left out how Your Js back-up catchers fared, here it is:  BA .152, OPS .470.  Pretty obvious why you left those #s out, for while your point 'bout back-up catchers is correct in broad terms, even allowing for that, Your Js back-ups had a season for the ages.

Your cavalcade of stats on other back-up catchers, obfuscation.  Irrelevant.  Totally meaningless and specious comparisons designed only to muddy the waters.