Vasilevskiy is the only question mark imho and even then he's been pretty decent since he started in the NHL. Plus he now has the best D in the east in front of him with the acquisition of McDonagh. McDonagh , Hedman , Stralman , Sergachev. That's a solid solid top 4 . Wouldn't be too concerned about him.
Upfront the depth is just crazy. Stamkos , Kucherov , Johnson , Point , Palat , Miller , Gourde and even Killorn to a certain extent. And on top of that one of them is the current art ross favorite and the other is one of the best goal scorer in the NHL.
Now of course the game is played on the ice so having the best roster on paper is one thing but that doesn't mean assured success. But on paper Tampa is the team to beat right now. If i had to predict i,d say Tampa vs Nashville will reach the finals.