wb amassed and protected territories enough to be recognized as an emperor
in his peak he was as strong as roger / the strongest man in the world.
luffy after wano wouldnt have amassed near the amount of dominance wb had attained or the strength talk less of the territorial control. he aint getting over 5 bil . and when he doesnt, I will come back here and say I told you so.
after wano the biggest threat would remain bb until luffy takes him down imo