Big Mom and Kaido are walled by Whitebeard as they want to become the Pirate Kings.
Are you gonna use this argument for Shanks too? Shsnks also didn’t want to become pirate king so you can also just say he was exactly the same as Whitebeard
also your idea of “walled” doesn’t even work because we are not told that Whitebeard had ever done a single thing to stop either Big mom or Kaido from doing anything they wanted.
Big mom was making her alliance with the giants whether Whitebeard liked it or not. Where is his wall in this instance? The reason her alliance with the giants fell apart had nothing to do with Whitebeard.
same for Kaido, Kaido killed Whitebeard’s man and Whitebeard didn’t do shit. Kaido ravaged Wano and set up his weapons manufacture empire to build his army and set up his smiles with Doffy and nothing Whitebeard said or did hindered a single thing Kaido was doing.
To become pirate king you need the 4 poneglyphs. Once again, literally nothing Whitebeard did stopped any of the other Yonko from finding the 4 poneglyphs.
what the hell are you even talking about “walling”? walling what? What the hell did Whitebeard ever do?
the only thing we know any Yonko ever did was stop other Yonko from getting more territory. And all the Yonko stopped each other just as well on this front. No Yonko, including Whitebeard could just take another yonko’s territory. That was the stalemate