Hi Jack,
I don't think any material on the game is a waist of your time. I think whatever books you choose is well worth your time. Nothing can replace experience but this material is from experience and helps the learning curve. I haven't read Jack K.' book but can tell you he knows his stuff. This double kiss rule is merely the cross side;/ cross over bank in reality. This I've learned from experience myself.
So many one pocket shots, banks, 9 ball and other games al inner-twine with eachother. When I came up it was 14.1 and one has to just use our imagination to see and understand how these shots are able to be done. That's the enjoyment I get from all the games. I'll put myself in a particular game mode to solve many problems during the game. When playing straight pool I'll think of the safety as if I'm playing one pocket. It's much easier to play it that way. Same with 9 ball.
Take care Jack and no matter what the read is, it's always going to bennifit you. You can always help out a friend too. When your done, you could always send them the gift of knowledge.
Regards,
C.C. ~~was sent Joe Tuckers Racking Secrets. Great for 9, 10, straight and 8 ball but I don't agree with his One Pocket break. still, a welcome gift even if it's for a little while. I got it down and that's all I need.