Evolution of Kata

Excerpt from Harry Cook's History and evolution of kata:...The great master of Shorin Ryu Choshin Chibana pointed out that "Karate, as it is transmitted, changes every few years. This is a common phenomenon. It happens because a teacher must continue to learn and adds his personality to the teachings. There is an old Okinawan martial arts saying that states that karate is much like a pond. In order for the pond to live, it must have infusions. It must have streams that feed the pond and replenish it. If this is not done then the pond becomes stagnant and dies. If the martial arts teacher does not receive infusion of new ideas/methods, then he, too, dies. He stagnates and, through boredom, dies of unnatural causes."...

It may be a common phenomenon..............however the teacher may just detract from the original form and omit or misrepresent by misunderstanding into his teachings. The pond will be sucked dry of some of the infusions and be diluted by watered down interpretation. The boredom of repetition without understanding then gets translated by inadequate authority.

Sounds about right to me.