I understand he was saying that - I just don't get why. A goal counts as much if you're a man up as it does if you're at evens.
Pretty much only top six players even get onto the power play, whereas at even strength teams generally run four lines, where lines 3 and 4 are significantly weaker at scoring. Therefore the impact of a top line offensive player at even strength is relatively more valuable. Aren't you the guy that downgraded modern goalies because they don't appear to make that much of a relative impact? It's the same logic for power play scoring: Everybody who steps on the ice for an NHL power play is at least competent offensively, so the difference is less significant between the absolute best and the floor.
Power play scoring is also much more affected by contextual factors than even strength scoring, so we can confidently put more trust in even strength scoring as being more reflective of an individual's talent level. Power play scoring is affected by a player's role on the team, by how much ice time the player gets, by how good the unit is, and by overall levels of penalties being called and how good a player's team is at drawing penalties.
The best example of all of these factors is what happened to the greatest power play scorer of all-time between 1995-96 and 1996-97. In 1995-96, Mario Lemieux scored 78 even strength points and 79 power play points, playing almost the entire power play on a great power play unit that had 420 power play opportunities since penalties were up league-wide. Then, over the course of one season, the following things happened:
1. Penalties went down by 19% league-wide.
2. Pittsburgh replaced Sergei Zubov with Kevin Hatcher.
3. Pittsburgh stopped letting Lemieux, Francis and Jagr play basically the entire power play (they went from being on the ice for 94%, 84% and 83% of the team's PPG to 73%, 68% and 55%).
The result? In 1996-97 Lemieux scored 79 even strength points and 37 power play points. Great illustration of how league rules, team factors and usage can cause huge variances from year to year even for good players (even while even strength numbers basically don't change at all).
If the question is who do you take going forward - sure. That could have some worth. But thats not the question were asking here.
Were looking at the past ONLY here. All goals have already been scored. ES or PP ones. They all count and are worth the same.
The fact that they all count the same is irrelevant to how much they are worth. Goals counted the same on the scoreboard in 1981-82 as they did in 2002-03, but if you think they are worth the same you are going to have a horribly skewed list in terms of era. Same logic applies for PP vs. ES scoring, the value is different and that should be taken into account.