Marchand scores just as much (or more recently) and is one of the best 3 zone forwards in the league and possibly the best penalty killing forward in the league. Not sure how it can be Kane given their actual play and stats, but perhaps the board doesn't put any value on defensive play.
The linemate argument for Marchand also makes no sense to me, his production increases when either Pasta or Bergeron are injured (yes even if they both are out at the same time).
Marchand is generally the best player on the ice in just about every game he plays these days.