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I think I understand where you going….Same key yes (for this purpose and intent). Tony changed one note in the scale from the Maj7 to the flat seven (to your point he did it once with the bass octave and once with the treble)…What has actually occurred here? The interval of the two notes comprising the second Diatonic half step interval have moved. How does that feel? And what does it allow for? It is a crossroads for tonal change should you want to pursue it. Using it in isolation allows for that sassy feel? Use what word you like. Sassy is a close but inadequit. Using it as a crossroads you can take off on haromonic adventure. You are right, it will confound you and then suddenly it will make sonic sense. Keep going Pete, you are absolutly on the right track….. And play more. : )