Hi!
First of all, thanks for your previous post regarding Naguras. I'll work on the Mejiro as you suggested.
Regarding the method in the video there are two thinghs to point out. First, here in Italy beginners are always advised to use a 3k to create the bevel. Not many start from 1K or 2K so, (second) I think that he wants to propose a limited use (also limited to the first part of the bevel near the edge) of a more aggressive stone, which eliminates any chips and quickly forms the bevel. Also, I believe he wants to show that there is not much difference between using and not using tape. As you know, using or not using tape is a dilemma that plagues many beginners. Btw. I prefer to use (my) 1k instead than (my) 3k to set the bevel... also if the blade is brand new and has nothing to be corrected. I find it fast and reliable.
I have these two diamond plates: the big chinese one (400/1000) & the small/a bit worn Eze-Lap 1200. To make slurry on Jnats I use the Eze-Lap.
Attachment 329826
I don't count laps except for the bevel stage (then I use a first series of 21 half strokes x side, followed by series of 11 as needed. Usually 1 or 2 series are enough. Blade at 45° and heel first. Eventually some x-strokes and/or rolling x if needed).
When on the Nakayama/Ozuku & Slurry...I alternate circles, full strokes, half strokes, x-strokes and/or rolling-x strokes. Sometime I finish with some spine leading (strop) strokes, sometime not. Of course I start with some pressure, progressively lightening it
I like red b.ground too... :) Happy you found the bevel straight enough! It means your lessons are not lost in the wind... :D