Never thought about it like that, it's a rather interesting explanation, but there is one assumption there: That the most intelligent of the population would c

Never thought about it like that, it's a rather interesting explanation, but there is one assumption there: That the most intelligent of the population would continue to choose priesthood event after celibacy was made mandatory by the Roman Catholic Church. Perhaps the most intelligent of the population did not continue to choose the path of celibacy over and over again for 25-50 generations.