Im not a scout or anything but Miller and Trouba play together and it seems like Miller is the young brother. Letting Trouba make the hits and pinch down the wall and behind the net. Trouba is a actually good at that part of his game in a vacuum. Unfortunately, it seems to leave Miller unsure of himself and he is constantly making bad reads and turnovers because of it. When he plays with Schneider there seems to be less deference to the veteran and more of him just playing. If I am Laviolette Im giving Trouba a new partner to mentor (Jones) and letting Schneider and Miller run for a bit. The coaching staff should have enough on tape to know that Miller and Trouba aint it. Any further pairing of those two is a coaching issue over a personnel issue imo.
Miller has a long reach and often that pokecheck will kill you when players avoid it. By the time you even bring your long reach back, you're out of position on the rush. I think we would all like to see him use his body more. I don't think we need Trouba-big-hits from him, but a simple putting your body in the way goes a long way.
Last night, Miller went for the long-reaching-pokecheck on MacKinnon and that was over as soon as Mac stepped around. Instead, it could have been a big hit. (which on the downside would have 100% created chaos hitting a player like MacKinnon). He could have simply bumped MacKinnon. I mean, It's MacKinnon, so it's hard to fault Miller when an elite player is coming down like a bull, but I think just stopping the 1st line of defense being the long reach while stepping forward would really help him.