This project can't be properly completed by including factors such as luck and potential. It does however include what would be intangibles such as QB elusiveness, schemed time to throw based on routes and Quarterback style such as pocket QB vs highly mobile and passing on the run ability. It includes designed Runs by QB and Runs because of coverage or failure to get a timely pass off. Those items also have an effect in the evaluation of Receivers and the Offensive Line. Let's say for example that Hurts didn't run for as much yardage as he did, and instead completed more passes at a rate of 70%, or in doing so was sacked more and absorbed more pressure those would affect stats.