I have some big stocks in Imu being above Rogernobody but endgame Luffy will surpass Roger imo
if blackbeard wasn’t enough to get there as-is then it must require significantly more threat, eg Roger could hear the poneglyphs and therefore knew the void century, so it makes sense his would be much higher
This chapter did reveal one of the names of the Gorosei as Saturn which are the rest of the planets with Imu being the earth. Also Imu - Umi which is water, which the world of OP is made entirely of.