The Carl demo is played at about the 1hr58m point in the video if anyone is curious.
https://www.youtube.com/watch?v=HkfWn195My8It's called "You Oughta Know" apparently (no, unfortunately it's not Carl singing about Dave Coulier), and it not surprisingly sounds like a cross between BB'85 and the Beckley-Lamm-Wilson stuff. In other words, it isn't A-list material. But it's nice to hear a new Carl track, and this does confirm what I've been going on and on about for YEARS, which is that there are surely some Carl demos/tracks from the 80s and 90s laying around that his estate has NO INTEREST in doing anything with.
I don't understand why his estate/family has zero interest in doing anything with Carl's legacy. As I've said in the past, I get it, maybe they think his legacy is being served via BB archival releases. But why not put more Carl stuff out? Unless Robert White Johnson was like hiding it from his estate, why not get this stuff out there. I can't imagine it's the only such track.