quoipourquoi
Goaltender
Being the clear-cut #1 center coming and going for a dynasty, for one. There was no 1B option here like Messier, Fedorov, Forsberg etc.
How does that make him better or worse? It doesn't even make him necessarily more responsible for his team's production, as in his five best runs, he recorded points on 117 of their 400 goals (29.3%). In Forsberg's five best, he had points on 35.2% of their goals despite playing on a different line than Sakic and that's including the goals they scored in the two rounds he missed in 2001.
And while the Avalanche did not have a dynasty from 1999-2002, they made it deep all four years with Peter Forsberg scoring 28-52-80 in 66 games (1.21) with a +29. You would have to look at players with half as many points in that time-frame to even find one at a point-per-game average.
That Trottier is a part of a dynasty while Forsberg is not has more to do with their teams' scoring depth. You can't criticize the effect of scoring distribution across lines and simultaneously flaunt Trottier as his team's #1 while deriding Forsberg for being #1B. Trottier isn't the Islanders dynasty; he was part of it. That a non-dynasty player performed better in losses than Trottier did in victory does not invalidate the Islanders' accomplishments as a whole. And celebrating Trottier because Bossy is a winger and Sakic is a center makes no sense. Playing with Bossy is a monstrous advantage.
The guy scored a point in 27(28? can't remember) straight playoff games over three playoffs (during the Isles streak of 19 series wins), won the Smythe, was tremendous both ways and hit everything that moved.
And what were the best defensive teams he played against during the dynasty? 1980 Buffalo (who kept him off the board in half their games)? During his point streak, he was shooting on teams that allowed 263, 317, 327, and 367 goals. He never had to carry his scoring streak into a matchup with the ~160-170 GA Dallas Stars.
You're assigning weight to something that would be substantially less likely to be replicated against teams that allowed fewer goals. Is there a single Stanley Cup champion that faced worse defensive competition than the 1981 New York Islanders? Maybe the 1982 New York Islanders.
And even if you think that not looking at the respective scoring environment whatsoever is preferable, Forsberg has better numbers than Trottier without the adjustment. Because Forsberg is not Trottier-Lite; he's Cherry Vanilla Trottier. He's Ruby Red Trottier. He's Trottier Voltage.