Yeah I’m not sure. They came up with it in 2011. So you had Vick and Cam, Tebow, was Josh Freeman really a runner? Next year you had RG3 and Russ Wilson join the fold. I would think they accounted for it in some way. But Lamar is going to break all of Vick’s records
They definitely account for it in some way. The main driver behind inventing it was to include rushing and sacks to the completions, incompletions, yards, TDs and INTs that QB Rating uses. And I have little problem believing that they do a good job of accounting for the value added by most QB rushes.
Lamar simply rushes so much that I think it probably breaks the model. Modeling extremes is very difficult, no matter what you're trying to model. I would imagine that Drew Brees and his insane completion percentage is also a difficult thing to accurately assess the value of.