Thing is, you can make a definite argument that Nash's superior play are a result of circumstance. The whole "system BS" is not 100% BS. How come Nash didn't make his teammates so much better before he came to the Suns?
I don't want to completely discredit Nash, however. While it seems obvious that he can and has only put up high number's in a run-n' gun system, It doesn't mean that any run of the mill PG would do the same. I think that many player's stats would definitely rise, but Nash really is the perfect PG for that situation, and he has some unique skills that make him so.
However, in the long run, you can see that Stockton's prime was more organic, steady and of course longer. He basically did, for over an entire career, what Nash has done for a few seasons.
the answer for the first question is easy: role.
when Nash came in to Dallas, he had amazing offensive players around him - Finley, Nowitzki, a lot of shooters and actually Nash made them better too, but not to the extent he made players better in Phoenix. you put the ball in Nash's hands and he makes teammates better, so the longer Nash has the ball in his hands, the more effective your offense is gonna be - it's really as simple as that.
r'n'g argument is the most overrated thing I've ever read about Nash. it seems like everyone is bringing that up but there's actually no proof that he's been a lesser player in slower offense. there is one case where you can expect Nash to regress statistically or make worse impact - you put the ball out of his hands. this was exactly the case when he was playing in Dallas and they had so many great offensive players that they didn't notice how great of a player Nash was. this was the case a year ago in Terry Porter offense as well, as he tried to make role player out of him and I don't have to tell you about the impact it had on Suns offense. it's really funny how people try to use this argument against Nash in Nash-Kidd debates, because if you look at these to players it's clearly Jason who is much more reliant on fast-break because he's not a scorer of Nash's caliber(and he wasn't even a scorer at all at any stage of his career) and can't create in the half-court offense the way Nash does.
the fact is that Nash is not only a fast-breaking PG. if I had to use labels here, I'd say Nash is a pick and roll, pass-first player. it doesn't have anything to do with the pace of the game. obviously Steve is great at leading the break but he doesn't regress in HCO the way some other PGs do. Nash would be great at any system whether it would be 90 poss/g offense or 110 poss/g offense. there's a lot of anecdotal arguments to back it up.
the reason why Suns offense is so fast isn't because they want to score as fast as they can. it's because Nash can create so easily and so fast, that Suns can get quality looks with 16 on the shot clock instead of 6. pick and roll based offense is great in that regard - I mean if your play is broken you can simply set a pick and create something very fast. it's really a matter of style and Nash's style is what people call 'winning'. you know, for example Lebron sometimes ballhogs the ball for 15-20 secs of the shot clock... Nash could give his team 2 or 3 successful offensive possessions in that period. so my point is that Suns play fast because they can get a quality looks so easily, not because they're running and shooting regardless of anything, as if it were the 60s.
and you can't say Stockton did what Nash has done in last few seasons. simply he wasn't ever offensive anchor of Nash's caliber. in his style he's more of a Calderon on offense, while Nash is more of Magic. I ain't saying the gap is similar to Magic/Calderon comparison, all I'm saying is Nash goes out there and creates while Stockton is more of a stationary, stad-padding guy like Calderon, or in softer words, his real impact isn't as big as boxscore numbers would indicate.
if you talk about statistical argument I'm like my main man
drza, boxscore stats mean something only when you take into account +/- numbers. that's because every stat has its flaws and the more data you can gather, the more accurate your conclusions will be. +/- stats and boxscore stats show very different things, they look at basketball from different angles, and that's why you have to take both into account.
well... in this case +/- numbers say that Nash is the best offensive player of the generation(post 2003) and this is with Kobe, Lebron, Wade, Garnett, Paul, Deron, Duncan, Nowitzki all in this league. Nash is not one of the best here, he's
the best, and it's by a pretty comfortable margin.
average offensive adj +/-(03-08)
Nash +8.84
Lebron +7.99
Kobe +7.62
Paul +7.46
Wade +7.00
Garnett +6.25
Dirk +4.71
Deron +3.31
Duncan +3.23
so I feel like boxscore stats are underrating Nash's game here and this is what his on/off court numbers indicate.