User blog comment:B214/Question and Answers/@comment-95.234.167.146-20130503181203/@comment-1359322-20130823084713

Nah, it has nothing to do with ranking, Pure-Blooded Devils have low birth rate that's why a reincarnation system was created. Even the number of the Phenex siblings at 4 are considered to be extremely rare for pure blooded Devils.