Dariusz,
You've got me busting a gut over here ... sorry about the spelling, that was pretty bad - my only excuse is I'm taking pain killers for a tendon issue - should call them 'brain killers'.
ROFL...all in good spirit, my friend. I am accustomed to this -- too bad that Polish version of Eastern fornames are with these letters "z" at the end that makes people do weird things....while the rest is the same (almost) -- Darius in English = Dariusz; Thomas = Tomasz; Marius = Mariusz, etc.
BTW, Phillip would be Filip
Dariusz , I think the 2X4 drill may be a good place to start. Where you place a piece of 2X4 about a foot and a half long where the ball is and get him into impact with a forward leaning shaft and getting him to squeeze it forward . That was a drill I was shown by some TGM guys to tidy up the follow through. I think a light bulb might go off in his head. Follow throughs are one of the easier parts of the swings to fix and everything else looks good.
Well, the problem is that the last thing I want to do is to implement a conscious handle dragging a'la TGM. According to last researches on ENSO, this is a SS killer, no matter it is a conscious hand action and I do not want him to think about hands/arms at all.
I have in mind some physical training he needs a lot of (long, weak arms; weak wrists). Old classic guys got this when polishing equipment from rust when they were kids and caddies. Today's kids are pampered mostly -- not knowing physical work, only books and notebook keyboards. Sad but true.
Never blame no one, not you or someone else. It's a great swing that needs only bit more progress and small changes in mind and he will be great. he got time, but he needs to figure out how to create those forces and fit them to those other great movements. Just keep on going.
We will try !
Cheers