Trivia: The actress playing Connie has the same surname as her character - Moreau.
Trivia: In the first scrimmage game between the Ducks and the new players, Dwayne says "It's a great day for hockey". That is a tribute to former USA Hockey player and coach "Badger" Bob Johnson, who died of brain cancer in 1991. Johnson used to say this to his players every day.
Trivia: Notice that in the first and second movies, both "villain" teams (Hawks and Iceland) are wearing the same style uniforms; Only the teams's crests are different.
Trivia: In reference to the 1980 USA Olympic team, Bombay asks everyone in the locker room who they are and where they are from. Coach Herb Brooks did the same thing to his players in 1980.
Answer: There may be a number of reasons, but the most likely is that, if players work really well together, it makes sense to have them on the same line, regardless if they are both enforcers or not. To give an example, the 1990s Detroit Red Wings had the "Grind Line", which consisted of three forwards who were all known for their aggressive, physical style. The two wingers in particular were team enforcers. They meshed so well as a unit it wouldn't have been as effective to split them onto different lines, just to provide an enforcer to each. The combination of all three on one line worked very well, and other teams copied the format, though of course it was not unique to this team (see, for example, the Philadelphia Flyers' Legion of Doom).