Thanks for this Mike. I think this is exactly the lesson I need right now. After a couple of months of working every day on the beginner track on this site, I feel OK with some of the basic chords and rolls. But when I recorded myself playing a couple of things and played them back, sounds a bit chaotic, and I think my lack of rhythm is why.
Also I found out I have a bit of ‘windmill thumb’, but that’s a different issue.