Team matchups are not universal. Team A can suck against team B but crush team C regularly. Team C can crush team B regularly... A small fast team might give a big slow defensive team fits, but a medium sized, physical, average speed team may destroy tthat smaller team, yet be outmuscled and shut down by the larger, slow team.
year to year favorable matchups change. For instance, When the Pens were short on wingers, teams that could contain their superstar centers were kryptonite to them.
since crosby and malkin have been hurt a lot the last few years the pens have added more offensive players to compensate.
The last two years teams like toronto and the flyers and isles that had a glut of speed, offense, and didnt play conseravtively tend to give them trouble. teams that play defensive first tend to give them less trouble. In just 3 years the description of what the worse matchup for the Pens has been has dramatically changed.
Teams adjust their makeup to strengthen weaknesses, which sometimes creates different weaknesses.. its an ongoing process...