By your own admission James Hetfield is a one trick pony?
When I say 'one trick pony' I mean that he may only know a couple of tunes.
I can well imagine if you stood in front of him for a few minutes you would hear the same tunes repeated.
On the busking scene you only need to know one tune to be successful.
Of course I could well be wrong about him but he is very good on that video.
I once had a lad at my studio (in t'80's) who was one of the best lead guitarists I'd heard.
He could shred for England but not could not do it on a backing track.
No matter how much tuition I gave him he could not play in key but take the music away and he was brilliant.
He ended up selling his gear.