I wasn't even paying attention to his human thumb. But I think he is using it as a mute and for fretting. I watched it again and it doesn't look like he is holding the neck up with his left hand. He just moves too effortlessly.Holding the neck like a baseball bat. Not an option for anyone with a more classical grip on the neck. He does seem to have a good strap though, so that's probably helping.
I'm not trying to say they don't dive or that most videos are of people playing sitting down.
Thanks.I wonder what the bass would have done if he did this!
View attachment 3059669
...'nuff said. Have at it youngins...