I recently watched this video, Marco Dawn is a German OP You Tuber who makes fair and neutral analysis and theories (He’s also a Sanji fan).
He has the theory that Enma is just a training sword for Zoro. Zoro learns through Enma a better CoA control and by mastering it he will reach at least Oden's lvl or surpass him EoW.
After that he will leave Enma in Wano an will get a new sword (maybe Kitetsu II?).
What do you guys think?
He also says that Zoro is basically fighting against King and Enma. Enma carries Oden's will and he must surpass him during that fight.