Nathan MacKinnon, of course, took home the Hart Trophy last season after that monstrous 51-goal, 140-point run, and knows a thing or two about what it takes to win. And his Cup-winning experience is something Mitch Marner and the Leafs have been missing and have taken their fair share of criticism for, especially in a high-pressure market like Toronto. While praise from MacKinnon may not shut down all the doubters, one thing's for sure, Marner held his own against some of the league's top talent over the summer.