Grim stroke is a great pick this meta, where early fighting in lane is more important. His kit, e especially, allows for carries like slark or ursa to be even more dangerous from minute 0. His other spells offer great wave clear, slow, and silence. The ultimate, is one of the best teamfighting abilities; however it requires some draft coordination, so make sure to communicate to your teammates to pick synergized heroes.

Grimstroke is best played as a position 5, but can play as a 4, if the draft allows for it