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While true, C defense is the least impactful by far. I do think CSs and PBs should be included in fangraphs.
In any case the Ms are almost surely to get worse in that category as well being that Johjima's arm and pitch blocking far exceeds any other M's cather.
Realistically we'll probably lose 1-1.5 WAR from that position next year, but the $ gains and development of Moore+RJ are worth it.