User blog comment:B214/High School DxD EX/@comment-201.53.24.131-20160110173515/@comment-27232228-20160116084433

Well do rememeber that the original list was mentioned by Vali and Ishi specifies it later. So the gauging is mostly came from Vali. He probably had heard or even tested the beings in the list, but not others (hence the absence of the other Chief Gods in the list like Odin, Zeus, Marduk, or even the Japanese Gods like Amaterasu or even Izanagi.