For the longest time we have been told that WB was the undeclared PK, the man who stood before the throne but never on it even when he could. There is one thing very confusing for me WB never had all the RPs so how could he become PK? He didn't have Kaido's or BM's that we know for sure, maybe he could get a rubbing off of BM's but he never been to Wano and Oden didn't tell about its contents to WB. Even Zou's was last shown to Roger IIRC. So without all the RPs how could WB become PK? Could he take the RPs from BM and Kaido or did he already know the location of Laugh Tale?
What separates the PK from Yonko's is being able to poach another Yonko's RHM, Shanks asked Marco but Marco refused, BM asked King and King refused but when Roger asked Oden he agreed. Technically Luffy has poached Jinbe from another crew but it is not like the other three instances.
What separates the PK from Yonko's is being able to poach another Yonko's RHM, Shanks asked Marco but Marco refused, BM asked King and King refused but when Roger asked Oden he agreed. Technically Luffy has poached Jinbe from another crew but it is not like the other three instances.