Bless your heart. You just made two points that were just not correct, but then again, I should be used to that from you.
I'm breaking the two points down for you to comprehend:
1--It will not mean Duke underachieved if he isn't one and done. That's where a lot of problems start with people saying asinine comments like that. What if he's an ok player, but Duke is really good. You've already determined success or underachievement by how long he plays for Duke. Think about that one for a second, and you should realize how dumb a comment that is.
2--We didn't win it all in 15 because Tyus was who we thought he was. He was better than we thought he was, and left after one season. Again, Okafor was the only preseason one and done.
I agree with you that we're expecting Tre to be good, but how good we don't know yet. Kind of the same with his older brother, we didn't know he was as special as he was until he'd played quite a bit.