When you get used to it, over time you build strength and it’s more subtle, that’s where EJ is at. In the second vid I posted if you forward to the last third where I turn the drive up, you’ll see the same thing happen. But to stay with the EJ clip, if you see his hand on the downstroke it’s def moving down, but you don’t see it rise, but it is returning for the downstroke, that return is the single motion of the upstroke and the pluck.
The thumb pick was very short lived for me, didn’t take it all the way, I didn’t like the tone, almost exclusively, most of the country I played was with a regular pick.