Well read the 11 months ago message but as was first time I watched this and enjoyed it thought I would contribute . Often I have formed a G7 by using top 3 strings fretted GBF then leaving others open and as in this lesson just sort of chugged it as it was transition chord the higher strings being GB and another G.
Of course this version makes it moveable but have found the form I use does sound with 4th Finger removed makes for passable A7 and B7 . What it does always show me and whilst not a master for sure but do know where to pick up notes on the fretboard you can never see enough.
For those that enjoyed this lesson I remember some that involved Tony Wray and some interesting F Chords for Transition and G to C and a different way of constructing a EM9 I think.
Thank you as always keen to learn this things often the high F being grabbed of course works but can sometimes just sound too high.