From my viewings of Montour, I have to say that his defense is fine. I expected him to be poor defensively, or to take chances offensively but I haven't found that to be the case. He likes to jump up into the play, acting like a fourth forward, but he's smart about when and where to do so. I believe he did play forward at times in the USHL.
He likes to keep his head up, looking for passing lanes and shooting options. Reminds me of Karlsson in that regard to shooting for tip ins.
The Ducks must have big plans for him to draft him where they did as a 20 year old. A full year in the AHL would be what's best for his development. AHL rookie of the month for November though.