I know this is not popular, but I will trust the Coach's opinion with regard to Miller.
There is something he is doing or not doing that is causing him to get scratched. Maybe it's a motivation technique, but I don't think so. AV wants to win games now, and coaches don't sit players that will help them win games very often, especially even keeled guys like AV.
It was not that long ago when most RangerLand was in an uproar about Renney having a vendetta against Prucha. Turned out Renny was right and Prucha just wasn't that good a hockey player.