As is often mentioned, Anko Itosu designed the Pinan series to essentially provide a summative and easily digestable method for practicing the techniques contained in several Shuri-te kata. Indeed, if you look at a form like Kusanku you will notice numerous sequences that appear at various points during the five Pinan kata. It stands to reason, in my mind, that movements which are essentially the same were intended to represent the same techniques. Yet, a lot of karate schools tend to teach these overlapping kata (such as the Pinan series and Kusanku). Is this tendency the result of a karate culture that does not pay enough attention to bunkai? If more karateka focussed on the application of techniques, would they see the need to streamline their kata, to avoid redundant techniques during training? Is it beneficial to include both older kata and their newer derivitives despite (or because of) this repitition? Thoughts?