I think you misunderstood what I'm saying there. I'm just saying there's good music to be found both places...and not just good music, lessons. You tend to lose out if you stop listening to either.
and I'm not knocking that style. I love it. I have learnt so much from watching and listening to Joe Pass...but even he's had influences and different styles of playing. Chord Substitution is the way to his eventual style but that's only 1 side to the legend. Extract from Wikipedia:
In addition to his ensemble performances, the jazz community regards Joe Pass as an influential solo guitarist. His solo style was marked by an advanced linear technique, sophisticated harmonic sense, counterpoint between improvised lead lines, bass figures and chords, spontaneous modulations, and transitions from fast tempos to rubato passages. He would regularly add what he called "color tones" to his compositions, to give what he believed was a more sophisticated and "funkier" sound. As common in jazz, he would achieve this by taking the basic chord, for example G7 and would improvise or substitute certain notes, so would play for example a G13 chord or would add other tones such as flat or sharpened 5ths and 9ths to the chord. He would then often connect them chromatically using his walking baseline of root notes.
Pass's early style (influenced by guitarist Django Reinhardt and saxophonist Charlie Parker), was marked by fast single-note lines and a flowing melodic sense. Pass had the unusual lifelong habit of breaking his guitar picks and playing only with the smaller part. As Pass made the transition from ensemble to solo guitar performance, he preferred to abandon the pick altogether, and play fingerstyle. He found this enabled him to execute his harmonic concepts more effectively. His series of solo albums, Virtuoso (volumes 1 through 4) are a demonstration of Pass's refined technique.
As for the theory, I would recommend a teacher...and you seem to have found someone who probably knows it.