I like most of these, Smith compares exactly to Kronwall. There is no better comparison for him in the entire league I dont think.
Nyquist, I think is more like a Filppula. Shifty hands, good D except Nyquist seems to have natural finishing ability that Val lacks.
I really like the Sobotka comparison for Tatar, I had never thought about it but it is a very good one.
Sheahan has better hands than Gaustad but I think Gaustad is his lowest potential really. Could see him becoming more of a Bolland type
I like the Kronwall-Smith and Filppula-Nyquist comparisons, but I've heard them a lot so I thought I'd try to come up with something different. There's just something about Smith that reminds me of Yandle. Maybe just the way they skate or their kind of lanky build, combined with the fact that they're offensive defensemen with some iffy play in their own zone at times.
I think Sheahan will be more like Gaustad than Bolland, but I think Gaustad is the extreme of Sheahan. When I think of Sheahan I think big, defensive center who's good on faceoffs and has limited offensive abilities. Gaustad takes each of these to the extreme - he's very big, very good defensively, very good on faceoffs, and is very limited offensively. Sheahan will be similar imo, but not to the extreme - i.e. maybe not as big and good defensively, but more offensive upside. I think 4th line C is a pessimistic projection for Sheahan and a consistent 40+ point 3rd line C is on the optimistic side, so somewhere in the middle is what I'm thinking.