The point that they can play at the highest level.
These aren't players that we can draft and have their career play out in the exact same manner. Even if you could miraculously bring a player out of a time machine only a fool would expect things to play out identically. By all means compare careers if you want, but most people are talking about comparing players. Comparing players means how good the players were, which encompasses multiple things but not just looking for an approximate value that someone just accumulates over time.
You don't need to assume a career plays out identically if removed to a different circumstance. -That's a needless reductio ad absurdum argument. It is possible to assess general quality of play and reasonably transpose that across eras.
It's also reasonable to base a judgement on the opportunities given and what they did with those opportunities over the course of their entire careers. It's not hard to recognize opportunities missed due to environmental factors (like WWII, lockouts, COVID, 50 game or 70 game seasons) vs things that are due to player attributes: Durability, quitting, choosing to play in a lessor league like the WHA or KHL, or declining play.
If Orr got figured out by the NHL and was useless in his 30s that would be one thing, but he got injured until he couldn't play. That makes his career worse, but doesn't really make him worse (ignoring that injuries limited even his prime years). Bourque doesn't just hang around long enough (as an elite player) and become better than Orr in year 22 or 23 or something. That's something that most people inherently understand. However good McDavid is, if he plays for another ten years putting up exactly a point per game it doesn't really make him a better player even if that player would be very valuable for ten years. It makes his career better, which is great for him and whoever employs him and cheers for his team. It shouldn't move the needle for him much when we're talking about the greatest players ever though.
We just fundamentally disagree on this point.
As I said, the entire purpose (IMO) of being a team member is to
contribute as much as possible to the team.
IMO the
entire benefit of being a better player is to provide more value to the team in a shorter period of time, therefore providing a greater value over the course of an entire career.
Whereas you think Orr proved the point - that he could be one of the best players ever - and so you are satisfied. End of story. The fact that Bourque went on to provide 13 additional high caliber seasons after that apparently is worth almost nothing to you. But in real life, it's worth a helluva lot to the team.
So yeah, I do think players like Bourque can surpass players who were better on a per-game basis - because I value longevity as well as peak. If longevity has no chance of ever surpassing peak, then longevity's value is precisely zero.
Put another way, if I'm a GM and I can draft Ray Bourque knowing that I get his total career in terms of general quality of play and games played and years played, and knowing that I can draft Bobby Orr with his total career in terms of general quality of play and games played and years played, I might very well take Bourque. IMO if you take a typical NHL franchise and add Ray Bourque, you may win more championships in that same period of time than if you take that same franchise and add Bobby Orr who is utterly useless for 11 of those 22 seasons.
That is my measure of greatness. Yours is almost entirely focused on peak play. I think most of us would describe that as "best" but not actually "greatest."
But again, it's odd to focus on best when the whole purpose of being the best is to become the greatest - at least if you are assuming the purpose of a teammate in a team sport is to contribute to the team, which again.
Or you could take the opinion that no, the purpose is to dazzle some people for some short period of time, and who cares about the team.