RETRACTED: The previous version of this post used some incorrect data. The problem has now been fixed, which radically changes the findings. In reality, the % of field goals assisted has very little to do with shooting efficiency (points per shot) and with winning. Though PPS remains highly correlated with winning. Apologies for the error.
Here's the updated, far less interesting graph, which plots PPS vs. % of FG assisted, with dot size corresponding to winning %.