I'd venture to say that the Tsunami Dragon Times videos and DVDs (which are now available) of Vol. 4, Shinu Gushi Weapon Arts are acurate portrayals of the way Gushi Sensei performs the kata.
And now that its been mentioned, on reflection, I'd have to say that the Tsunami Dragon Times videos (2 vols.) of Shinpo Mayayoshi are flavorful samples and not the entree.

The Bunkai are a joke; one or two examples. The DVD of Master Matayoshi's senior students is the real deal.
There seems to be a prevailing practice standard: if there are multiple angles of the kata shown, if there are slow motion and regular speed versions as well ... then it's a teaching demo from which you can practice the kata.
If it's a performance at a major event ... check out GEM's 33rd Anniversary tape of Uechi Kanbun's death ... there are many excellent weapons kata performed in completeness and not as a representative samplings of techniques for a particular weapon.
I have a Sakagawa No Koun tape out of Jamestown NY performed by some Goju karata. They advertise that is exactly as taught by a certain Goju master, The kata seems to me to be an enhanced and elaborated version of Sakagawa No Koun but very wooden with no drama or art.
I bet it is exactly as the master taught the beginner. It may be an excellent learning medium for the geography but there's no flow, timing or intensity.
There is much to make of every moment.