Florida has been through the wars, and deserve to be favoured in this series. They are probably the most complete team in the league, defending Cup champs and 2X Eastern Conference champions. They've been there and have proven they can win it all.
If the Leafs are going to pull off the upset, they will need to match, or at least compete with, Florida's intensity. Matthews, Marner and Nylander will have to be their best players, and they will need figure out a way to hold limit that third line's impact on the series.
I think a lot of people that haven't watched the Leafs this year are in for a surprise. Treliving has built the Leafs for this matchup. Literally, anticipating having to play Florida in the first or second round. Will it be enough? I'm not sure. The Cats are a damn good team. But it's going to be fun to watch....