I guess if I were to make a counterpoint, though I'm unsure if I want to, it would be: there are no statistics that paint a 100% accurate, clear and consistent picture of such a broad scope. So why would this use of a statistic be expected to?
Moreover, statistics are the residual of the story, they don't make the story. The story comes first, always. So there's a story and there's some supporting statistical evidence in this case. Trying to extrapolate the evidence used in the Gretzky/Robinson example and apply it to others doesn't seem relevant.
I mean, that's kind of the business we're in here, eh? Look at the Andreychuk HHOF discussion...one guy loves the idea of 640 goals, everyone else says "yeah, but compared to..." or "because of..." and there's a story. The story overrides. In some instances, some of us used the fact that there were so many PP goals as a negative even...but it's very likely that in a discussion about Tomas Holmstrom's place in history among bottom six forwards that PP contributions would be viewed as a major positive.
That's a weak, rambling example as I recover from a weekend-long, tequila-fueled bender, but the underlying point is that evidence of this nature has a natural proximity clause, so to speak. We don't have any one-size-fits-all stats for anything, why does C1958's have to perform at that level...?