Most players dont play the whole 60 min. Gotta divide by 20min a night, not 60 min in a game. Shanny spent over a season of his career in the box
If we break it down by 20 minutes, wouldn't that be assuming that he would have been on the ice for every minute he was in the box? For example, if he gets in a fight and serves a 5 minute major, he wouldn't have played all 5 minutes that he served, he would have played about 1:40 of that time(1:40 of a 5 minute penalty translates to 20 minutes a game). You can really only assume he would have played an addition 830 minutes had he never taken a penalty in his career.
Forwards play roughly 20 minutes a night, we'll say.
Brendan Shanahan played 1524 games, which would equal 30,480 minutes.
He scored 1354 points, which is a point every 22.5 minutes.
That's 111 points he missed out on, just on averages.
Not a huge amount considering all players take some penalties in their career, but you also have to consider that being in the box also eliminates a lot of potential PP time - prime stuff for a guy like Shanny.
Shanahan had 2,489 penalty minute in his career. He obviously wouldn't play all of those minutes. If we assume he would have played a third of those minutes which translates to 20 minutes a game, that's 830 minutes of icetime he lost out on. If he scores a point every 22.5 minutes he's on the ice, that's 37 points in 830 minutes. Those 37 points wouldn't make much of a difference and again that's assuming he would have never taken a penalty. Even if he only took 50 PIM each season which is around the average for a player, that would take 16 of those 37 extra points away, so now we're talking about adding 21 points to his total.
Also, coaches are pretty good at getting their players consistent ice time. If Shanny gets in a fight there's a good chance that he will finish the game up around 18-20 minutes. It's not like he normally plays 20 minutes but if he has 5 PIM that game that he's only going to play 15 minutes. They'll find a way to use him at least close to his regular ice time.
Again, if I'm wrong, let me know. I just think the whole PIM thing is blown way out of proportion.