Every each on of them have an average intelligence? That's quite optimistic. Because OF COURSE all normal beings can just think as them, obviously.
I'm not dismissing Ed from being intelligent, but keep in mind that every one of them lives in a different world with different challenges and intelligence comes with many shapes...
To be honest, all this poll was about thinking who'll be compatible with Ed's intellect. He may be smart as other more intelligent anime characters, but seriously if I'll put Ed with L, Lelouch or Light- people wouldn't even consider it.
I only watched about 35 anime, therefore I can't find the righteous answer, tell me who'd be compatible for Ed.