Putting Fast in the same box as McKegg or SMITH is a very weird categorization.
Fast is a beast on the forecheck and one of the better players in the league at getting chances around the net. He only shoots when he has a good opportunity, which is actually a good thing since his shot in and of itself isn't that great. He is 27th in the league in 5v5 Sh% over the past three seasons (just a few spots behind Panarin) despite having a below average shot and the clear #1 in xSh%. In addition he is one of the best defensive forwards in the league.
Zibanejad has had better results in every category with Fast on his line than without Fast over the past three seasons.
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He's scored 5v5 points at a higher rate than Ryan Strome, Mike Hoffman, Derek Stepan and Alex Galchenyuk over the past three seasons.