Gambo said the the first two players that the Suns interviewed (or are scheduled to interview) at the draft combine are Exum and Smart. They are only allowed to interview a limited number of players.
That seems strange in several ways.
It would likely be difficult to get players at the top of the draft to come in for a visit with the Suns projected draft picks. So I don't really find it strange for them to take this opportunity to find out about the players outside of what they've seen on film.