Fake reason, you need two to tango.
Real reason, the front office is scared. They did their homework on one or two prospects where they were 100% comfortable with taking them. One of them was gone, and Horn was sitting there. It's why the pick took so long. There were people in the room very much advocating for two other players, but because both the coach and GM feel the need to play it safe they opted with the guy they were sure on.
Not really a great scene.