But I'm including Sedin's prime, I'm not forgetting about it and only including Sedin's seasons of being past his prime. Actually, as a matter of fact, I'm actually doing Sedin a favor by using his 25-34 years as opposed to his total career, it would be even more lopsided if I used his entire career.
As a matter of fact, Sedin's peak season was when he was 29, which Sid isn't even at yet (he won't be 29 until the 16-17 season). So it seems kinda stupid to say that Sedin's best was better than Crosby's best when Sedin peaked at an age that Crosby isn't even at yet. I'd say it's not an unsafe bet to say that Crosby's best assist season will be in the next few seasons, that's right when Sedin peaked. The only way that Sedin beats Crosby in assists per game is if you compare a 26-31 year old Sedin to a 18-27 year old Crosby while not including any seasons where Crosby did not play in 70 games. The difference if you do that is minuscule as well, it's .840 assist/game for Crosby compared to .848 for Sedin. So you have to make a lot of number manipulations and compare a player in his prime to a developing player to prove your point.
So no, back to your original point, I don't think Sedin is clearly the 2nd best playmaker in this generation. You have to heavily play with stats and make baseless omissions (like saying you can't include shortened seasons because it inflates point totals, which I've already shown to be false; it inflates individual season paces, not career totals) to prove that he has the 2nd best assists/game ratio. Oh yeah, you also have to ignore linemates, which I think has a big factor that I have tried to avoid addressing (Sedin>anyone Crosby has had for any extended period of time as a linemate).