During the salary-cap era, the NHL has become a league of duos.
The Chicago Blackhawks (Patrick Kane and Jonathan Toews) and Pittsburgh Penguins (Sidney Crosby and Evgeni Malkin) have two of the best twosomes of that span, which began in 2005 -- and both teams have combined for six championships since the start of the 2005-06 season.
Granted, both the Blackhawks and Penguins have several other players who have played large roles -- such as Duncan Keith and Marian Hossa in Chicago, and Kris Letang and Phil Kessel in Pittsburgh -- but if a team's top two skaters aren't elite, it's hard to go all the way.