Let me put it this way:
We can all agree that for a team with one elite caliber player to win a cup is nearly impossible, yes? I'd argue it's even difficult for teams with two.
So once you start getting into teams with three, have the high quality wingers of this age ever had that?
Ovechkin- Nah, unless you count Mike Green which is debatable.
Kovalchuk- addressed, no. Hossa was it.
Alfie- Debatable. Chara/Young Spezza? He also had Hossa/Heatley, Havlat, that team was stacked, outside of center, tho they had good depth there too.
MSL - Yes, Richards/Lecavalier/is Khabi a stretch? When two star centers are your cast does that help your point?
Iginla - Not until he was out of his peak
Sedin- Yes. Lost game 7.
Zetterberg - Yes.
Vanek - No.
Perry - Yes.
Nash - No.
Kane - Yes.
The only cups post lockout come from "yes," obviously. The lesson here is not that wingers don't matter but that wingers can't do it by themselves. Can centers? Same metric applied.
Crosby/Malkin - Yes
Thornton - Debatable
Sedin - See above
Datsyuk - Yes
Staal- No
Spezza - Above
Stamkos - Yes
Kopi - Yes
Bergeron - Yes
Toews - Yes
Lotta cups on that list. But with the exception of Eric Staal, every single one of those with cups had support of at least two other elite players. Centers can't do it by themselves, either.