After a playoff series ends, the handshake line is typically led by each team's captain.
After the Detroit Red Wings won the Stanley Cup against Pittsburgh in 2008, it took two minutes before captain Nicklas Lidstrom led the Red Wings' handshake line.
The next season the Penguins won the rematch. As the Red Wings patiently waited, Crosby continued celebrating as his teammates went through the handshakes.
By the time Crosby joined, many of Detroit's players were already in the locker room.
As captain of an NHL team, it is unsportsmanlike to botch such a tradition.