Small addition is this piece from the wonderfully talented Rany Jazayerli, which shows how the Royals' offense had changed (for the worse) after Seitzer's departure, trading doubles for homers. Jazayerli references a Russel Carleton piece which claimed that Seitzer was worth about 58 runs over the average hitting coach, and through some mathematics and words that I have not read, Carleton concluded that Seitzer was worth 4.5 wins above a replacement-level coach. Basically, as Jazayerli said in his article, Seitzer had been one of the best hitting coaches in the last two decades.
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4.5 WAR hitting coach ladies and gentlemen!