LOL, stating the obvious.
Tell me what toll does not need training.
Again you are not answering at all and dodging.
Do you need the tool to get stronger or he can just get stronger without it?
You dismissed the toll 100%, stating that the training is what makes him stronger!
He is training to utilize 100% the toll, that simple.
Can he cut Kaido without Enma, tell me?
If he can't that mean he got a PU.
Similar logic, can Luffy wound Kaido without Advance COA?
If you say yes then you are correct.
Every training takes a toll on someone, that is why it is advisable to not push yourself too much.
Again I answered your question. The sword by itself does not make Zoro stronger, it is the mastering of the sword and the mastering of his haki that will make him stronger.
Nah, I told you already mastering the sword and mastering his haki is the training that will make him stronger.
Enma uses his haki to cut Kaido, logically if he can cut Kaido with Enma, that uses his haki, he can do so with other swords as well. Currently we do not know if Zoro can cut Kaido with his haki level, but once he masters it by training with it and Enma he should be able to cut Kaido. Enma does not gather haki from the world so Zoro can use it, it is his own haki.
Faulty comparison. Luffy already tried and we saw how pitiful he is, and the result was, as we all know, no wound made, instead he got one shot.