"Ichigo, what's the difference between a King and his horse? I don't mean kiddy shit like 'One's a person and one's an animal' or 'One has two legs and one has four'. If their form, ability, and power were exactly the same, why is it that one becomes the King and controls the battle, while the other becomes the horse and carries the King?! There's only one answer; INSTINCT!"
"I don't know about Zangetsu, but I sure as hell won't tolerate a king who's weaker than me, getting on my back, running around and getting us both killed. I'll crush you, if you're weaker then me... I'll become the King!"
"...but don't you forget, the king and his horse can change places at any time. If I see even a slight opening I'll buck you off and crush your skull!"