The biggest issue, of course, is it's premature to rank McDavid. To get a spot in the top ten, he needs more longevity (he's barely played 600 games - and before someone compares that to Orr's 657 games, McDavid simply isn't as impactful as a player),
Is it even humanly possible in today's NHL to run circles around other players to the extent that was available during Orr's career?
According to your thread estimating the size of the talent pool, the competition per roster spot was at an all-time low during Orr's career. There were some pretty bad players to take advantage of in the early to mid 70s.
IMO some sort of adjustment would be equitable.
Of course, we could look at hardware and that bodes well for McDavid. Against a far larger talent pool, he's already equaled Bobby Orr in Hart placements. He's likely pacing for another 3 this season.
Orr
1, 1, 1, 3, 3, 3, 3, 4, 6
McDavid
1, 1, 1, 2, 3, 5, 5
Of course you can say Orr is a defenseman so he's underrated this way. And that is a fair point. But again, that is counteracted by the gargantuan 3x difference in talent pool size.
Ranking Orr in the top 4 with only 731 total games played is inevitably problematic. It strongly implies that longevity is worth very little, and so the case against McDavid being in the top 10 right now is weak for anyone who puts Orr very high, let alone above Gordie Howe.
On that basis I think it is unreasonable for you to claim McDavid needs 5-10 more seasons. He's arguably matched Bobby Orr's regular season career right now.
(I don't even care if he wins a Cup - but I need to see more than 49 games, and more than one appearance past the second round).
Bobby Orr only made it past the second round 3 times in his entire career. It's not some big difference.
Bobby Orr only played 76 playoff games. McDavid could conceivably get close to that with 1 deep playoff run.
I think what you are saying here is pretty arbitrary. 1 player does not carry a team. It has never happened - not even with Bobby Orr. Faulting McDavid for team success is not a strong point to hang your hat on IMO - particularly given his excellent playoff statistics.
McDavid has 655 total games played vs Orr's 731. It's an 11% difference and set to be zero within roughly a year from now. You want to focus on 27 missing playoff games from McDavid's resume? That's likely going to evaporate.
There is also the shear difference in the likelihood of team advancement in a 32 team league of mostly well-established teams (and where expansion teams can do well) vs a 12/14/16/18 team league where half the teams are new expansion teams that didn't stand a chance. An adjustment in that regard would also be equitable.