All, read the manga.
Morgans: this liveliness!! I’ll never get enough of it!!
【Emperor Kaido and Emperor Big Mom have been defeated!!
It took little time before the world is taken by this huge news
The three pirate captains, Monkey D Luffy, Eustass C(aptain) Kid, and Trafalgar Law, managed to take down two of the Emperors who have ruled these seas for decades
And thus the Government has placed a 3 Billion berries bounty on each of their heads, an exceptional amount!!!】
How Kaido and Big Mom were defeated is irrelevant. It's just the fact they were defeated. Without everyone's help Kaido and Big Mom wouldn't have went down.
The article even makes is sound like it was a 3v2 battle and we know it wasn't. It was 1v1 and 2v1. That after those two Yonkos fought other fighters.
Zoro > Kid/Law.
Nothing anyone will say will change the fact Big Mom was defeated because of the bombs. If you take the bombs and magma away would Big Mom have been defeated by Kid and Law? Answer, no. While Zoro has the AP to damage and take down a character with much greater durability and endurance alone.