I'm not sure of "he is no priest material". There was one Avvakum (born 1621-burned 1682, the founder of "old believers" in Russia, and a very interesting writer). He was counted as leading godly life, both during his lifetime and after his death. Well, he belonged to married clergy. Once, while he was receiving a confession, his flesh became excited - and he immediately put his hand in the candle flame and kept it there till his flesh calmed down. This and other similar acts gave him greater moral authority to place demands on his flock - for he treated himself worse than he treated them.
But that is different, as Patriarch Avvakum kept his body intact, and administered a proper confession. Castration is not mortification of flesh -- it insults the Creator.