Board Thread:Questions and Answers/@comment-10797017-20130624101208/@comment-26420452-20130710091342

Ichigo doesn't have the temperament to learn Kidō, nor does he have the capability (he just can't control the Reiatsu he gives off). Furthermore, I think it'll be futile to try to fight the Quincies with Kidō, knowing their inherent ability to absorb Reishi and use it as their weapons. So, the Kidō Corps will be useless in the battlefront. The only way to manage to beat a Stern Ritter is tactics, brute force and swordsmanship.