I agree with you, it wasn't about the workflow but how he separate different parts of the skulls with colors and how muscles relate with it once the skull is done.
Hey guys, take a look at this video showing the skull broken up in the most important parts, it also places the muscles and everything on ZBrush! Pretty usefull if you are studying anatomy: https://www.youtube.com/watch?v=rjbiUj-FD-o