https://arioso7.wordpress.com/2015/01/10/piano-technique-the-relaxed-thumb/Interested in sharing, feedback...
The one bit I did kind of get, that you see the thumb as the anchor of your hand, seems to me just plain wrong. I don't mean by that that you don't see it that way, just that you shouldn't. It's a useful appendage, of course, but not what the hand revolves around.
No, and no. I'm arguing that your third finger is the anchor of your hand, and the third finger is required for just as much if not more than your thumb for everything piano related.