Hesitated between options 3 and 4, and I eventually voted 3. Top after Gretzky and Lemieux, but not a huge gap above the field. But - I could also see him not be at the top.
'Peak McDavid' last season paced for ~150 points. Unique division format, and short season, so let's see next year how he fares and maybe put that into proper context, but there's a very good chance that season ends up being as amazing as it looks on the surface.
Crosby in 2010-2011 was fantastic
Jagr has seasons up there.
Probably a couple more.
This may sound like a foolish way to think of things but to me, if the top 30 offensive players ever were placed in one league on separate teams with exactly equal team support, I'd expect Gretzky to finish first in scoring, Lemieux to finish second if he plays enough games, and then probably Howe. But I'm a lot more confident in Gretzky and healthy Lemieux finishing first and second than I am that Howe finishes third. I am confident that Howe would have a better season outside of offence than anyone who might finish ahead of him.
To steal your premise, and add to my point. If we take the top 30 players of all-time and put them at even settings and said "go" - I'd bet:
1. Gretzky scores most points. In fact if you repeat that season 10x in a row (imagine no ageing) - he tops scoring all 10x. Or at least, is super consistent at the top, with Mario possibly topping him a few times.
2. Lemieux is a bit of a wildcard. Very, very close to Gretzky at the top. He might even top him a few times if we ran this 10x- possibly by a good bit once or twice. But less consistent. Consistently above anyone else, but if Gretzky were to hit ~205-210 every year, Lemieux likely goes from ~180 to 220, ups and downs. Probably has most goals though.
3. Howe is most likely to finish 3rd - but any of Crosby, McDavid, Jagr could top him. Don't think Ovechkin or Lafleur quite have that overall offense to be there too at that level, nor Esposito. Don't know if I'm forgetting anyone else obvious, but those are the 3 names that come to mind about possibly topping Howe at their absolute bests.
Howe is also talented enough offensively that if Lemieux has one of his 'down/inconsistent' years and barely scratches 180 points, and if Howe has his absolutely best of the best ever season - Howe could maybe top/pace that.