Really enjoyed this, Chris, especially in the focus on pull and getting a lot of flesh on the string. I'd like to open a discussion on the wrist, though! I agree that the wrist needs to absorb some of the force generated from the hip/back/shoulder/arm as it goes through to the fingers and string, but I don't think it needs to do it in this exaggerated wave motion. Looking at Ray Brown, George Mraz and Sam Jones, for example, you can't see much of this type of motion at all. I'm sure the wrist is working to absorb the force, but it is doing it naturally and unobtrusively, simply by being held in a fairly neutral relaxed position. Yes, you see a bit more of it with Ron Carter, but on the other hand you don't see much arm and shoulder pull, so I suspect he is using the wrist wave motion to generate force rather than to absorb it. It works for him, obviously, but you couldn't guarantee success for your students!
I can see that the exaggerated wave could be a good starting point for students with a stiff right arm, but my concern is that it looks very similar, in the end result, to the very damaging technique used by bass guitar switchers who try to play the double bass as they played the guitar, from the fingers, with both wrists curled!
Of course the wave technique you are talking about is completely different, because it is used to absorb rather than generate energy - would it be worth explaining the difference in a later instalment?