I find it odd that when you are challenged to show a chain sharpening on video, you only do a partial chain sharpening. While it is true that taking down the depth gauges isn't essential each time, you are admitting that you didn't do a complete job.
I find it remarkable that you have three more right-side cutters on that first chain than you do left-side cutters. Methinks you may have been skipping a few spots. That's ok, I'm sure they didn't need sharpening anyway.
You started with a chain mounted in the grinder, ready to grind, no adjustments to make. Another step that got skipped.
Now this whole thing got started when you said you could do a large collection of other people's chains in a small amount of time. For any puppy to suggest that he can sharpen 10-20 chains in 15 minutes, especially truly dull ones that can't be "touched" in order to sharpen, then your 5 minute partial-sharpening video has proven my point.
I never said you couldn't do a "pretend" sharpening of throwing sparks off of every tooth. I think I also mentioned "before" pics, too, so that we could tell if you were making a pretend sharpening out of it. Alas. My concerns have been confirmed.
A reminder: