Well neither of those things are for sure. Give Nyquist/Tatar a full season playing in the top 6 and who knows what they'd produce. They'll never score 20+ goals if they never get a real chance. Nyquist spent way too much time on the 3rd and 4th lines last year. Tatar has looked quite good in GR and was excellent for Slovakia in the latest WHC.
Sammy is of course way more proven, but with his age also comes the question marks of whether he can keep producing like he has, and if he can stay healthy for most of the season.
Like I said, I've always liked Sammy. I was one of the (few) fans that was very sad to see him go a couple of years ago. I hope he does well and justifies the decision to bring him back instead of maybe giving some of the kids a bigger role.
Depth.... I relish in the memories of the day we could roll 3 lines that could put up points.... those days are hopefully returning (to an extent). This is what I would love to see:
Parise - Datsyuk - Brunner / Nyquist (Competing)
Franzen - Zetterberg - Samuelsson
Cleary - Filppula - Bertuzzi
Abdelkader - Helm - Tootoo (I'd personally like to see us either let Abdelkader walk or trade him and give Eaves that spot). I don't want to see Eaves get the shaft just because he had one year injured, he adds scoring depth and can put up 15 even on the bottom two lines.
Suter - Kronwall
Quincey - White
Ericsson - Smith