Dunn shouldnt be on our radar anyway. He is not special compared to the other prospects, does not fill a need and is only 2 years younger than Knight.
To me the #4 pick comes down to Brown, Chriss, Bender or Murray.
It seems to me that the priority for the first 2 picks is definitely going to be PF at 4 or 13 and small forward with the other pick. For example Chriss and Luwawu/Prince or Brown and Labissiere/Davis/Ellenson.
At 28 and 34 there seem to be a LOT of center prospects available:
Thon Maker
Damion Jones
Ante Zizic
Ivica Zubac
Diamond Stone
Stephen Zimmermann
AJ Hammons
Zhou QI
Georgios Papagiannis
just to name a few..
Also PG prospects:
Dejounte Murray
Tyler Ulis
Gary Payton II
Demetrius Jackson
Cat Barber
Kay Felder