We did. A series of psychological tests were run for Exum in the run-up to the draft - he was given a set of tests that measure, among other things, intelligence, spatial awareness, and leadership. He scored higher on those assessments than any other player on the Jazz.
Exum is going to be fine. He's coming off a major injury, missed a year of development, is still one of the youngest players in the league, is playing the most complicated position with the lengthiest development arc, and still, despite that, has made progress this year from year one.
He's still the point guard of the future, but it's doubtful he takes a major leap before next year.
The amount of lucky breaks it would take for the Jazz to win a championship this year is almost too numerous to imagine and would require significant injuries to other teams. We can put ourselves in a position to take advantage of that, in the off chance that it does happen, but we aren't going to trade major future assets for a back-up point guard that is no longer in his prime. That's the type of move you make when you're a lock as a contender. The Jazz are still two years away from that - and development from Rudy, Hood, Exum, and Lyles are going to be what takes them there - not a washed-up former point guard.