Because the chiefs have a much better QB for their system they run. And a much younger QB in Coyle.. And did I mention he is alot cheaper too.
In other words, it would make no sense.. to be truly honest, I dont see how it makes sense for any team to have that gimp C-pep as their QB..
He can only be effective on a team that just lobs the ball up like the old Oakland vertical offense.. And c-pep needs all world receivers on his team to have any kind of decent output.. Not many teams like that left with that combination...