I recognized Vegeta, He Man and Chun Li at a glance, but not familiar with the last two.
I agree with trying out the 1 layer approach. Funny enough, he now posted a video on 4 layers as well.
It's all about expermenting and trying out different things for the experience of it. Even if it doesn't become our prefed method, you learn a lot by just trying it out, and get to feed those learnings into your own workflow.