once you are in the o-zone, there is no north-south ...north-south is how you get into the o-zone.
mind you, Marner isnt a dump and chase winger, and the leafs dont really have many that are.
their best 1-on-1 board player(s) is actually JT and Matthews, they usually win their board battles and can control the puck in tight, but, they arent the guys you send in to fetch the puck, that would need to fall to a McMann, or a Knies etc.
You will need a big bodied/physical digger on every line (or someone that plays big, like Domi), with the Marner's being the 3rd guy, ready to strip and control the puck away, and at that Marner would excel.
in the o-zone, its basically, dig-strip/control-shoot