About Doncic there is a valid concern IMO in that Real Madrid is a better run organization than Phoenix or Sacramento. And he has a great situation there, winning it all at such a young age and being the fans favourite. Also, Madrid is a great place to live.
But I think the rumours are wrong, the sensible thing is to move to the NBA once you can, get that fat salary and play against the best competition in the world. He seems very independently minded which is also great, some times Europeans delay coming over bcs their parents (usually the father) exercise pressure. Vezhenkov was such a case.
Regarding Isaac Bonga, I ll ask ppl who follow the Bundesliga and get back to you.