I think we all know the athletic skills of Napier. He is a great PG, he has an amazing body and he helped a lot the Huskies to win the NCAA Championship.
Yes, indeed, we all know these facts. BUT do we know the Celtic side of Shabazz? As he has claimed he wants to be a Celtic and he would go crazy if he would be selected by the C's. So why not?
If the Celtics go for Exum, who by the way is a great PG (and SG), he could help the team but as he himself has claimed he feels like a Laker. So go for Exum and select another ordinary #17 pick or go for Napier at the pick #17 and maybe get a top 3 pick or an SG?
All in all, I believe that Napier could give passion to the Celtics, something that currently NBA is runnig out of.