Even going back to his Chicago days aside from his rookie year, Dach has basically been gifted a top 6 spot despite not showing he's capable of being a top 6 player over a full season. He's finally in a different position now where he'll have competition and have to beat out players to earn more minutes.
At this point in his career with all his time lost to injuries, being put in a lower role with lower expectations is probably the best thing for him to get back on track.
The Heineman - Evans - Armia line was awesome last year prior to Heineman getting hurt, so perhaps Dach could took over the Armia role on that line.