Swing Review - “funky” swing

Here are some thoughts on the single arm releases.

I think you're making some good changes. Take a look at the before and after impact position of the swings you have posted. The second image is him at impact with the trail hand only. If you put his left arm on, because of the position (retraction) of his shoulder blade at this point, the left arm would be completely covered by his chest. Not a lot of side bend and the upper body is more rotated As far as the ulnar deviation, there are a couple of things to consider there too. I don't know what the ulnar deviation patterns look like on Hack Motion. But on AMM, typically the more obvious ulnar deviation pattern is the timing of the wrists unhinging and rehinging after impact. With the rehinging aspect, it shows up more with the trail wrist. With the lead wrist, the graph you posted shows a good bit of hinging during the downswing. Which means it still fits in the "could use ulnar deviation training" pattern. I wouldn't go just off the lead wrist graph to decide if someone could benefit from ulnar deviation training. Also, the amount (less the pattern, but more the amount) of ulnar deviation can vary depending on the grip orientation.

Looks like a good change. That would likely improve sequencing and turf contact and help minimize pulls :) If the funky swing can do it, then he'd likely get similar improvement. I'd be concerned that he might get some fat shots, but hopefully, he can work through it if that happens. So yes, if he can make the change as easily, then he'll see some predictable benefits!