If Hutton is a difference maker and is leaving for greener pastures, he will be the first one in 6 years to do so. That's not bad. Every other player that has left under Fran has left because they weren't good enough to play here.
There is no reason to be believe Hutton was good. He didn't blow up on AAU, he didn't garner all state honors his senior year, he didn't flash in the prime time league, and the gossip is that he was the furthest behind of the freshman wings. He had very limited offense, and you can't play a wing with no shout outside of 10 feet.