Tite Kubo said this quote
“ Whats the difference between a king and his horse?I dont mean some kiddy shit like one has 4 legs and the other has 2, or ones a person and ones an animal. If their form, ability, and power is exactly the same, then why is it one becomes the king and controls the battle and the other one becomes the horse and carries the king? There's only one answer...INSTINCT!!! ”