That's a whole lotta "ifs." There are only so many butterflies you can step on in the past.
We have what we have. Yzerman has his accomplishments, Crosby has his. I am a lifelong Wings fan and I love Yzerman to death, but to deny that Crosby should be placed higher on the all-time pedestal is straight-up homerism.
I mean we're trying to compare the incommensurable, players that basically didn't overlap in terms of their career lol. Everything is based counterfactual reasoning, including trying to compare accomplishments or stats or whatever, which of are heavily based on factors outside a player's own agency.
For the examples I gave, it's well established that it was Messier from the Oiler greats who blossomed as a player due to Gretzky's effect and far exceeded his potential (obviously Kurri, Coffey, and so on benefited as well, but their talent was seen as juniors before ever playing with Gretzky it was much more likely that they'd hit their potential than Messier). It's also a well established sentiment contemporaneously that Yzerman's star would shine brighter if it wasn't for Gretzky and Lemieux.
If your all time pedestal is just based on comparing stats and awards from different eras, I mean OK, but quite frankly, that entire enterprise is just based on a house of cards lol
Yzerman at his zenith was compared
directly to Gretzky and Lemieux themselves not lesser players, and had a good showing, not much more that could be more flattering.
Lastly, this is Crosby and Ovechkin lol, it isn't like a Lindros or McDavid, at least with the latter, I can see what makes them better players than Stevie. The former though, not so much, call me a homer if you want (and yeah would say the same thing about them vs Messier or Bourque or Coffey or whoever of Yzerman's contemporaries).
Let me just turn to the great Brett Hull: