The title doesn't say the creator, it says creator. Hence, it is accompanied by the "one of the first twenty". Unless he was the one to come up with the idea of the WG and the other 19 kings joined, which is also a possibility. I just wonder how Imu became the king of the world. By simply outliving the rest? Corrupting the WG from within with his powers?
Tbf I also skip chapters from time to time after getting the big picture through summaries/raws, lol.