Wrist Position in Backswing

[Bagger Lance]

I am wondering, though, if Lynn has the feeling of turning his left hand more than what would feel like 90* to achieve this phenomenal alignment?

Thank you, guys!

Lynn is pretty transparent about what he does and he uses a LOT of drills to fine tune his motion. When he takes his hands to the turned shoulder plane location he does a couple of simple things:
Flat backstroke shoulder turn
Right hand pickup straight back, up, and in to the TSP (See the Paddle Drills)
Extensor Action, Extensor Action, EXTENSOR ACTION
Delayed Hip Action - He clears the right hip in advance to make room for the hands.
Right Knee Anchor