It would be easy to say that Kyrie Irving or Derrick Williams would add instant impact to any team from the Cleveland Cavaliers to the Miami Heat. But what if each team needed to draft for a specific void on their team?
Think about the Memphis Grizzlies; sure, Irving or Williams would be nice but they already have Rudy Gay and Mike Conley. Yes, you can argue the Irving would be a huge improvement but he doesn't fit what exactly the Grizzlies need.
The Grizzlies don't necessarily need more scoring; if Gay returns and is healthy, they don't need that. What the Grizzlies could use is a backup center, possibly a starter if Marc Gasol leaves. Enes Kanter would make more sense for them than either Kyrie Irving or Derrick Williams.
This is the same logic that will be applied to every team, regardless of their actual draft position.