I agree with both of your posts, but I do disagree with one part- European junior coaching is very good. Professional teams have programs for different age groups. I started playing when I was seven. You practice a few times every week. You are taught fundamentals from the day you start. You learn to play every position. The reason guys like Sabonis, Divac, etc were such great passers is because they all learned to play point guard before they were over 7 feet tall. By the time you hit your teenage years, the system is pretty intense. I played in high school here, and I can tell you that HS level stuff here is a joke compared to 12-13 year-old age group in Europe. Due to knee injuries and having PG height with a PF weight, I didn't make it to a college team, so I can't speak to that, but I would guess coaching and training is far more intense in a major European professional team.
All that said, the bottom line is that he is a very young kid and it is way too early to call him a bust. Time will tell.