I have 4 of Good Ol Mantooth's books. There are the 'normal' chords, and in red, his suggestions. Often there might be a minor 7th then moving somewhere.

I thought he was way up there, not just the normal play a 6th and a 9th type of guy.

That said, jazz piano and I are either me myself and I, or Band in a Box and I. I recently worked on a video not yet done, where I do a voice intro sounding just like a guy from the radio most Canadians who listened to CBC would know, and saying basically here's these 2 guys and John where the other 2 were Band in a Box guys. My wife really laughed at it and I'm going to trick my brother with it. He sings in a gospel trio and they use backing tracks, wireless miss, and man there are some good spots, but a lot of MUD. Lots of MUD. If you didn't know the piece you'd go WhAT??

Anyway, you got to have the basic chord and root right, then the guy with the lead can go wherever as long as the others just forget embellishing.

John Conley
Musica est vita