I would start by addressing our apparent biggest weakness - the third line.I would use our best non-stars to make the best 3rd line possible.
Mikheyev - Kerfoot - Hyman
That's a 3rd line with great speed and defense, a good amount of offensive skill, and size and grit on the wings. That's closer to a solid 2nd line tbh.
Then I'd rely on two stars to carry each of the top two lines. Matthews Tavares Marner Nylander. Doesn't really matter which winger goes with which center.
Then I'd let all the rest of the more one dimensional forwards fight it out for those two complementary top line roles, with the losers battling it out for the 4th line spot.
I might try these to start, but really would let the players decide the answer based on their play:
Thornton - Matthews - Nylander
Vesey - Tavares - Marner
Thornton who is slow and doesn't shoot, gets paired up with two fast dominant possession guys, both of whom can retrieve and control the puck, go hard to the net, and both who can snipe of his setups.
Vesey brings some a decent all around size/speed/finish skillset with the fewest weak spots to complement Tavares and mitch with the safest but least sexy option. He's have a shot at 20 goals on that line. Robertson would be the sexier option but I'm not sold he's ready yet. But I'd love to see him win that spot.
That would leave Spezza and Simmonds on the 4th line to start, with all of Robertson Engvall barabanov Boyd Anderson fighting for the last spot.
But really, I could see any of those guys as a potential fit on those top two lines as well. So I'd keep an open mind there.
An interesting option for the 4th line would be Anderson-Engvall-Barabanov. 3 guys who can skate and who bring size and/or grit and a bit of offense too. I could see that being a 3rd line quality 2-way line even this year. But that would require either injuries or sitting more than one of vesey/spezza/simmonds which im not sure would happen.
The one guy I'm least excited to see is Simmonds. I sure hope he has some magic health turnaround because otherwise he's pretty much unplayable and shouldn't be in the lineup.
The coolest outcome would be if both old man Thornton and young Robertson could legit earn those scoring spots:
Thornton - Matthews - Nylander
Robertson - Tavares - Marner
Mikheyev - Kerfoot - Hyman
Vesey - Spezza - Simmonds
Barabanov - Engvall - Anderson