I know some consider Dragon a fraud. I don't, I still rate him as an OP character so strong he can only be used in special occasions. But this goes to show that as powerful WB, BM, Kaido, Shanks, Mihawk or Dragon are/were - and Roger obviously died of illness but still, he was 50+ - the WG is just a different beast.
Only Joy Boy has the capacity to gather all the allies needed and has the luck to keep surviving what would be certain death for anybody else.