Being a winner is both being on a winning team, and being a reason that it is a winning team.
That is, certain players make teammates better, thus increase the odds of the team outperforming its talent.
To me Couts is one of those guys, Voracek and Simmonds are not.
I think that's why Hextall has focused on accumulating smart, two way centers who are good playmakers, Couts, Patrick, Frost, Vorobyev, Rubtsov. They can make their wings better players by covering their butt on defense and getting them the puck.
On the other hand, I don't think Laughton is that kind of center.