I would say in the top 10 you have to draft a guy that you believe has the potential to be a cornerstone. If said player falls a little short of that potential you probably still have a really nice player. Jimmer doesn't even have the potential to be a cornerstone for a franchise. That's why I don't think he's somebody you draft inside the top 10.
So if there are only 6 "cornerstone potential" players, do the teams picking 7-10 say pass?
And with the 7th pick in the 2011 NBA Draft, the Utah Jazz select....."Pass".
Steve Nash, drafted 15th, and many others did not "have the potential" either, and they were only role players on their teams..... until they broke out.
Nash started to get good in Dallas, but really broke out back in Phoenix.
His first year in Phoenix (rookie) he got 10.5 minutes.
There are tons of great players that get slow starts, so I think your claim he (or anyone) doesn't even have potential to be a "cornerstone" player is garbage.
You may be playing the odds by saying that, but many times teams and front offices are proven wrong one way or another.
Jimmer could easily do what Nash did following his first 8 years progression in the league. Play spotty defense, get the averages up to 17 pts and 7 assists shooting 47% from the field, 40% from 3, and 88% from the line.