I think there is something that gets missed in this discussion and that's that the NBA draft is an irrational perception driven process. It's how a guy like Kwame Brown gets picked #1.
So at the end of the day, it doesn't really matter whether Wiggins, Parker, Embiid, and Exum end up being franchise players or that some already know they are overrated.... The thing that matters is that most think that they are huge talents and the perception is that if you can get one you can present them as franchise changers.
Thus, for a GM like Danny, the value of a top 4 pick is exponential.
Sounds like a lot of hyperbole to me.
Sorry, but people don't 'know' anyone is overrated. They have opinions about how the players will develop. I can randomly generate opinions of all the top players and some of the randomly generated opinions will end up being accurate as their career plays out. That doesn't mean that I 'knew' anything. If we actually look at the analysis out there, it is pretty clear that Parker is a safer pick as he seems like he could easily fit into any team's rotation while Wiggins and Embiid are more risk with much higher potential upsides. Personally, I have reservations about anyone who likes to talk in terms of 'overrated' and 'underrated'. It is a meaningless way to evaluate talent.
Thing is, even many of the greatest players of all time were not all-star level as a rookie. Guys have to develop. College players are young and no where near their prime yet in skill or knowledge. So nothing is guaranteed.
On the other hand, there are clearly better statistical outcomes at different draft positions. It would be ludicrous if someone were to claim that draft position doesn't matter. Tell that to San Antonio or Cleveland. Where would OKC be without high draft picks?