sorry for the confusion.
you're right, Chizu was picked to pilot since Kako was killed prematurely. But, I was saying, since 14 people signed the contract, that it would require 14 pilots. Kokopelli already said his didn't count. Also, I don't see her as never getting involved. It's just my hunch.
I changed my opinon of Kodama after reading his fight in the manga (chapters 6-7). They draw a much better picture of him... I won't go into it here, I posted in the manga section.
...i've stopped reading the manga, due to some differences in chronology between the anime and the manga. also, the anime adds lot of stuff about the Japanese government early on that the manga simply doesn't have.