Comtois makes so much sense for this team. Probably can sign him to around 2M. Can be a really effective 3rd liner, and has shown a full season of being a above average top 6 W. Still very young, always been good on the PK and forechecks very effectively. Hasn't been on a good team in his career really.
Comtois, Knies, Robertson, Jarnkrok (LW/RW) is a pretty cheap, good skating, good forechecking left side to help balance an expensive right side of Nylander, Marner etc. The first three are also young enough to be part of the 'next round' of the this team if they do a retool at some point.