Why is he different? Doncic is putting up the best numbers of all-time in the second best league in the world at the age of 18. You really think Doncic wouldn't completely just decimate at the NCAA level? That is crazy to me he is playing against former NBA players and pros that can actually make NBA/G-League rosters. Doncic is playing PROS while college prospects like Bagley and Ayton are playing KIDS and majority will never play any form of pro ball.
Europe is a different game. You keep thinking it's the same but it's not. How many scrubs from the US went to Europe to have a long and fruitful career? I can name a countless number of great college players who've done extremely well in Europe ... who couldn't sniff a NBA roster. What NBA player goes to Europe by choice? Josh Childress?
Who are the Europeans who "decimated" NCAA basketball? Markannen? Poeltl? Sabonis? Len? LOL. Bottomline: how many American scrubs from the US go to Europe and do well? Too many to count.
That does not mean Doncic can't be good in the US. However, the US and Europe are 2 different games. It's very different ... especially for guards.
So sell me why Doncic will be great in America? Because at 18 years of age he's beating G League Americans playing European basketball?
Do you know anything about soccer? There's a reason why Europeans scoff at Americans playing soccer in the US. It's a different game. Americans soccer players are great until ~17 ... and then they stop developing. It wasn't until Pulisic the narrative changed. Even then, Pulisic trained in Germany from the age of 15.
The Great Teodosic hurt himself in a couple of games. Is he a NBA player? Sure. A star? Absolutely not. Tell us why you think Doncic's "intangibles" gives him a higher upside than other European guards before? NBA scouts draft on potential. Why will Doncic continue to grow as a player? Why will he able to compete against the elite NBA guards? Jimmer Fredette killed it in the G Leagues too. The same thing was said about Mirotic for years.
That's not to say Doncic can't do it ... but you seem to think that the European game is the same as the US. It's not. Even hockey is different in Europe vs. North America.