'Coil' is weak to marginal.
CO ... I agree that 'coil' isn't this kid's biggest issue.
IMO, this kid is out of sequence ... so I would start by teaching a correct sequence. Establish pre-set conditions ... then Coil, Stretch and Swing.
The Coil can be significantly improved ... and since that is the start of a sequence, I would personally cover that.
Biggest issue, IMO, is the lack of "Stretch".
What would you do about the arm bar, back elbow leaking, and the push through contact?
What about fanning the front foot open?
Don't you think those are issues?
Looking some feedback GOOD or BAD about my daughter swing. She just turned 13 and video was shot with game pitcher. Hit was a single to right center.
What would you do to improve on this swing.