What's the difference between a king and his horse? If their form, ability, and power are exactly the same, why is it that one becomes the king and leads them into battle, while the other becomes the horse and carries the king? So what's the characteristic that distinguishes these two beings?

There's only one answer! INSTINCT!

In fact, it forms the very essence of our being-Deep, within our body lies the honed instinct to dominate, and slaughter our enemies! My friend' you don't have that! You're weak...Ichigo!

I don't know about Zangetsu. But I refuse to play horse to a king who's weaker than me, If you aren't willing to assert your strength and retain the crown, then I'll destroy you......Which means......I'll be king.