Disclaimer - I intend this to be a thought-provoking post. No slight on anyone is meant.
Let's say you attend a seminar by a senior and very well respected instructor in your organisation. During the seminar he teaches a kata which you've never seen before. It's quite a simple form and you pick up the shape of it after a few repetitions. He then goes on to teach a good number of applications, the majority of which ring true with you. They are all good, solid applications and take into account all the factors of a real-life self-protection situation (no arrow catching or hopping over the bodies of fallen warriors here).
Given the status of the instructor (or perhaps a language barrier, or simply lack of time) you aren't able to question the kata. You come away with a new kata and a handful of pragmatic applications, but no name, history or even lineage to go with it.
So taken are you with this new kata that you continue to study it in the following months. Again and again you come across new applications. The principles of this new kata just seem to keep on giving.
Here's the sting in the tail then - after spending many an hour practicing the new kata and its applications you hear that the senior instructor who taught it made it up on the spot. The question is - does that de-value the lessons you've learnt? Are the applications you were taught, and the ones you've devised for yourself, any less valid?