Thanks to the fancy SportsVU cameras there's the "assist opportunities per game" stat, that stands for: passes by a player to a teammate in which the teammate attempts a shot, and if made, would be an assist.
Here are the numbers:
There's no automatic way that I know of to automatically put these numbers per 36 or to download a nice and clean csv but it's pretty clear that, accounting for minutes playes, Greivis is a willing passer and his teammates are missing a fair amount of shots.
Anyway, one can estimate how many assists per game Vasquez would have if he was playing with average shooting teammates.
I'm no statistician so there's a high probability that Capt. reads this and spits out whatever he's eating, but whatever.
The result:
Vasquez's per 36 assists: 7.2
Vasquez's per 36 assists with average shooting teammates: 9.2, in line with his New Orleans production
Takes this with a grain of salt though, NBA.com lineup charts are quite messy and half of the minutes are missing. In short: very small sample size.