Just watch him. I have watched him play literally 50 games live, as he grew up around here. My son played against him a couple of times. Miller is a fast skater, but often just stands stationary on the ice, rather than continuously moving to adjust to the play, as most NHL players do. I think it's as a result of him moving back to D, and it still not being natural.
It was pretty well common knowledge that Miller was still having trouble adjusting to D when he was on the NDTP, and made all kinds of mistakes. To pretend otherwise is odd. Changing instincts from one of an attacking forward to a Dman is not easy, and some never do it.
I'm not negative on Miller, at all. All his deficiencies are fixable, and his raw tools are impressive.
Minnetonka - 2014-2015 Regular Season - Roster
He is listed here as a forward. I can't remember if he played forward or D with the Skippers. I always saw him as a forward around here.