After hearing that Brown shot 76/100 on threes, presumably on his second workout, I think it will be him. The C's brass liked him enough to bring him back for round 2, and then he killed it. Meanwhile, Dunn didn't agree to a workout.
I wouldn't love this pick, but if it is true that Brown's shot has progressed, then I am okay with it.
The single most likely option is probably a trade, although at this point it's well below 50%.