@frogman
Thanks for taking the time to go into this topic in more depth. What you say makes sense.
As a guitar player, I understand the significance of modes.
Perhaps Fusion is itself too broad a term because as time went on, the genre changed quite a bit. Now that we’re into this topic, I’m not even sure when Fusion started. Is "Extrapolation" Fusion? What about "Odyssey of Iska" or "Mountain in the Clouds" or the first version of RTR w/ F. Purim? Or, are these transitional, occupying a hazy territory somewhere between Jazz and Fusion?
The above albums sound very different, to my ears, than say "School Days" , "Splendido Hotel" or "In Search of a Dream". These albums are much slicker, more Funk and Rock influenced, with a more overt emphasis on dazzling chops and "tunes" based on (to me) often monotonous riffs/ostinatos rather actual chord changes.
BTW, the "Lifetime" album I referred to was not the one with larry Young and Johnny Mac. It was this:
https://www.youtube.com/watch?v=4DZccr0dzWE