To be honest, I don't see a lot of diffrence between your idea and the movies. The Jedi are quite obviously "comprised (of) a group of very arrogant politician-like Jedi who could not see what was going on" already. Yoda does protest the training of Anakin, but is apparently overuled. The only diffrence is in the combat. You have him not even trying, then running away. The movie has his little green butt handed to him, then running away. The role of a very powerful, but little respected, Jedi is already filled by Anakin. And by Qui-Gon for that matter.