Interesting that Enquist uses the phrase "club head" repeatedly in the first video. ;-)
Sue now works with Don Slaught. So many of the older versions of what her and Candrea taught have changed. That is an issue with some of the videos that are posted on this site. Have to watch when they were made.
The test is whether their ideas hold up to what video shows.
Most ideas fall apart with even the most cursory inspection.
It is harder because some stuff gets heavy into physics and physiology, but that's generally only 5% or so of the stuff.
The rest of the stuff is verifiable with a few videos.