Thanks. I might use a little more explanation about the weight shift.
There's another vid by Stephen Fearing.
This is a much older-school vid and his technique is rougher than Aiko, Janne, Jean-Luc etc. But he does try to explain a lot of the same concepts, and shows them in parts with various drills.
Flats drills at 2:10 onward.
Aiko's really puts it all together from the ground up which is very helpful.