Cutting the cliff was something with Zoro ability he was chopping up town sized pica with little issue Enma is nothing more than drain on the users haki lol. The sword enhancing your cutting ability is your pure copium both times Kaido was scarred other swords were involved.
Oden used two sworstyle the Ame no habakiri and enma playing equal role in that feat. Zoro replicated the same relying on all 3 of his sword using his own haki
Zoro was talking about taking Kaido down with him not just putting him on his kness. What good would that even do
Zoro strongest attack in near death state damaged Kaido more than anything Luffy has shown Kaido acknowledged said it would leave a scar a feat only one man before him achieved. What requires Luffy million hits Zoro can inflict more damage with single attack