Pete never used traditional folk harmony but embellished his accompaniments with guitaristic bass lines, thirteen chords, ninth chords and certain minor chord progressions.
He occasionally used a bVI9 chord on gospel numbers such as "This Little Light of Mine".
Pete opened up the five-string banjo to a variety of folk styles. He did a great arrangement of Irving Berlin's "Blue Skies" with the correct chord changes.

He was a trained musician who knew a lot more about music than he let on.
His half-sister Peggy was the same.

6th to 1st: G, C, E, G, B, E. Any way you slice it, it's still a C Maj7/G with a doubled 3rd.
It in itself has no passing tones. The above example in a previous post includes an A
in the bass line which is a passing tone in C.

C root, B seventh, A sixth, G fifth, not a Cmaj7/G