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IF ... if ... Napoli's catching woes caused a deterioration in the pitchers' well-being, then likely this syndrome did *begin* in 2009. And reached fruition this year, under pressure from the stRangers.
If Napoli's catching was a source of ill-being for pitchers, then he might very well have caused subpar years for any number of pitchers as they got out of synch .... and here's where life becomes too complex to measure. You're not going to capture that by comparing Napoli's CERA's with other guys'. The pitchers come to have subpar years in general.
The lack of swagger with the pitchers then causes hitters to press, etc etc.
We should know. We watched it happen with the pitchers' antipathy towards Johjima.