you don't need haki to cut steel.
when zoro asked koshiro about swordsmen that cut anything... he didn't teach him what haki is... he taught him that succumbing your sword ti you intentions is the key to cut nothing and everything
.
when zoro asked koshiro about swordsmen that cut anything... he didn't teach him what haki is... he taught him that succumbing your sword ti you intentions is the key to cut nothing and everything
.