Overall, he looks pretty inconsistent and the swing looks forced (as opposed to loose/free/efficient). The linear vs rotational thing doesn't really matter at this point because the hitter doesn't repeat anything. My guess is the hitter isn't familiar with either term anyway.
Has the player seen this video yet? If yes, what were his reactions? If no, why not??
Some questions I would have for the hitter when watching the video with him to spark conversation:
- What do you see?
- What do you think about your back foot?
- What are you trying to do with that back foot? Back knee? Back hip?
- Overall, how do you feel about your balance?
I would avoid talking about the hands until you see adjustments with the feet.
Two more things:
1. Filming from behind the hitter will help diagnose timing issues. (Poor timing could be causing his hands to do some things that aren't improved by adjusting his feet.)
2. This kid is gassed. Do these swings actually represent his game swing?