"For lack of a longer Club" refers to... if you have a six iron and need more power go to a five iron. No need to add one Thrust to the other (can be risky). You don't have that option with a driver. It already is the longest club in your bag (exception: long putter).
Also, if you were to read dkerby's post and the "quote"- you could easily assume that when one uses a driver, that Homer Kelley was saying that one "must" use both pivot thrust and power package thrust. Certainly, while you may choose to do that if you'd like- there would be no "must". When you read the entire paragraph - you get a little better understanding of the context that he meant that in. And it also shows how a quote out of context can take on an entirely different meaning. Nothing against Dkerby's post or question- that's certainly a very legitimate question.
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Life Goal- Developing a new theory of movement based on Brain Science
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Thanks Dewritgolf and Mike O. I read the whole paragraph
but just could not get a handle on the out of text sentence.
I will put your posts into my yellow book.