You have to consider, the draft in general is a gamble. Everything is a gamble.
A lot of teams draft players that have the raw ability to wreak havoc but are not yet, nor may they ever be, quite there physically; a lot of teams also draft these "potential" picks too high (Grizzlies, I'm looking at you).
Brandon Jennings has the physical skills, and the body, but his at ude is a BIG "if" hanging over his future. Again, drafted very high; he was a calculated gamble.
You see foreign guys crop up all over that have played very well professional overseas and teams are hoping their skills convert. Jian Liang (sp?) a good example. He's a gamble, but again, a calculated one.
So then you look at a guy like Blair, a guy with the skills, the body, and the at ude that will directly translate to the NBA. His health issues provide the gamble. So let's say you get 3-4 years and a good role player out of him, isn't that worth it alone?
But teams get scared by the Bynums and Odens of the league. They had health risks, and it doomed them. But Bynum was also a risk; only 18 when he was taken. Oden was receiving AARP checks before he graduated high school.
It amazes me that people passed on Blair.
And I'm so happy they did.