Geez, that's helpful! Anyway, from what I remember in my MSF. Cover the clutch lever, not the brake lever.
Glad to see you remembered and just to show you no matter what state you take it it from or from which instructor, the MSF curriculum is the same.
As a beginnng rider, it is best not to cover the front brake but covering the clutch is a good idea, especially in traffic. As I say, wrist down, knuckes up. You should only cover the front brake when you are about or you think you will need to use it. We consider covering the front brake while riding as one of the bad habits that riders develop. So once these habits are incorporated into the rider, it's really tough for anyone to change them. Kind of like a golfer trying to change that bad golf swing.
I have not read Nick's book so I'm really not familiar with his advanced riding techniques. But what I can tell you that most riders have not developed the finesse and muscle memory to utilize the front brake correctly. It is the number one cause of our crashes, applying improper front brake often when the handle bars are not square. I see it just about every week. I warn them time and time, and whenever I get a rider who crashes, and after I ask them if they are okay, I will say "I told you so."
I'm trying to visualize covering the front brake while riding, rolling on and off the throttle while pressing right and left on the handgrips. The clutch I cover, but it's not an issue since my left hand is not rolling on and off.