Yes.
I might say no if Dunn was a 6'1" pass-first PG who can't score, but he's not. He's a 6'4" 220 pound athletic beast who can score in a variety of ways, rebounds at a high level, and can defend multiple positions.
Nothing at all stopping us from putting him at the SG spot alongside Thomas.
So yeah, if he's the BPA you take him.