Form Critique for friend

[Unreal]

https://www.youtube.com/watch?v=C42a5LRgABo

https://www.youtube.com/watch?v=vgC6pePPAlE


I have helped him as much as possible but I am unsure how to fix his coiling and his reach back. I have had him on a standstill regimen only throwing putters but to no avail.
Any ideas and criticism will be a great help as he is an extremely motivated individual that will work on this daily.

 

[sidewinder22]

Door Frame Drill. He is turning his head/upper body ahead of his hips and arm/disc. Lead from the hips and anchor with the head.