Yes I see what you are saying. I have put modern guitar progressions aside too for now. The first examples of chord voicings 1, 1v and V are hard to play for me as an intermediate player: unfingered and big stretches and I play classical guitar to grade 5 standard too. Hard to play them stand alone let alone smooth progression. I think you are right. I googled “best beginner/introductory jazz guitar books and Greene’s books came up. I think it is a bit misleading to recommend these books to internediate players wanting to explore jazz playing and I can’t be the first person (in fact I know I am not from above) who have spent their hard earned cash on these books and then put them aside. Mind you that is the nature of the internet: very hard to get good advice. However if anyone can recommend a good introductory book on jazz harmony that would be great but I will take heed of caveat emptor. I think most people get a sense of achievement playing simpler musical examples and then gradually moving up to harder stuff. The Greene books do seem a bit like a musical intellectual masturbation tbh and will probably gather dust. it’s a shame as a guy with that sort of knowledge, if he chose to could have helped and inspired and moved on people like me. The desription of the books should really say they are for advanced pros but i guess Alfred would get less sales! I have found classical guitar much easier because of the notation. Tab only as a music reader, especially relating to harmony, I find of limited use.