I agree I kind of think we missed the point. The video wasn't about look at how good a martial artist Elvis was. Rather it was along the lines of "Hey look at this old footage I found from back in the day".
As far as Elvis' rank, I always wondered who cares? I mean first of all it happened over thirty years ago. And Since Kenpo was Ed Parker's art he was free to give rank to whomever he wished. If that person didn't deserve the rank, well that fell back on Mr. Parker. I never cared about others rank or if they were good enough for it. I always assumed another persons high rank was their burden to carry around, not mine.