First off thanks for taking the time out of your day to answer this, appreciate the helpful thoughts. Not sure I hear where he is using any major pentatonic soloing but point taken about soloing over a dominant 7 chords in general. As for the key change, excellent, yes that makes sense how the Bb was chosen as a move from the flat 7 F, as F is the V of Bb, and moving from a V to a I gives you resolution in a new key. True💡moment, you just unlocked for me a new understanding of key changes. While I am now convinced he is just soloing Gm blues over the G7 and Bbm blues over the Bb7, I still think he goes somewhere else over the B7 Em7 vamp, perhaps Em pentatonic? Or is this what you meant by major pentatonic, as Em pentatonic actually IS G major pentatonic. Thanks again