Ah, i remember Part 1, where "Kage-level" meant alot, and it was almost unreachable.
Now? Well, the last 20 chapters should answer that. There are too many characters to name, not to mention characters that are in a league of their own, and even the characters below them can stomp the Kages solo without breaking a sweat. Sooo, yeah... Kage level hardly implies power now.