Knowing how kings lunarians powers work doesn't automatically mean you beat him. Like queen is still overall weaker than king even with knowledge
Zoro was basically stronger than King even before CoC.
Even without CoC, he would have beat him.
Eh i wouldn't go that far imo
I do think zoro needed better master over enma and his haki to beat king but not necessarily needing conquerors to do so
Zoro was still getting overpowered by king before he learned how to make better use of enma. After it tho without conquerors i still think hed be able to win
Like i think current zoro can beat king without conquerors