Draft picks are scouted somewhat differently to FAs in most cases, in the sense that more weight is placed on potential, relative to age. While having good statistics certainly may help your draft stock, be it in college or foreign professional leagues, NBA scouts look at those differently.
They focus more on advanced stats like PPP (point per possession) in particular situation to tell them how efficiently the player can score in certain situation that occurs frequently in the NBA such as a PnR (pick and roll) play. For backcourt/wing players like Ferguson, they may look at your Assist% and TO% to see if you have the potential to play the point.
Aside from stats, they look at intangibles such as attitude, coachability, competitiveness, awareness and IQ with regards to decision-making in broken plays.
The average NBL fan will probably look at Ferguson and reckons he's crap, didn't help the team much offensively, physically too weak and has shitty stats, etc. A scout will have definitely noted that for his under-developed 18 year old frame, Ferguson fearlessly bodied up to guys like Hollyfield and Maric, worked hard with good lateral movement to contain similar or smaller guards, pick his shots carefully instead of chucking it wily nilly as soon as he touches the ball and looks patient enough to play within a system/role.
There are quite a few scouting reports on him floating out there on the net. If you read or watch enough of them, you'll get plenty of ideas what the scouts were looking at and why his draft stock hasn't suffered much.
