The Celtic bigs have little value around the league. Nobody is standing inline to trade for KO, Amir, Sully, JJ etc. This group is weak at best.
The smalls, the guards of the C's are the organizations trade bait. DA will draft Dunn just to not let teams that rally want him have a shot at getting him. It gives him leverage, and a fine draft pick.
Danny will draft Dunn, and then try to trade him, or another guard to improve his bigs. If he has to keep Dunn, it's not a big deal, look for Smart to see action at the 3 in small ball lineups. He can defend all but the best 3's in the league.
Dunn is looked at as a PG that can make a nice impact in his rookie year, DA will take advantage of this. It allows the C's to trade another guard of value to improve the PF and C positions.