Alright, I've worked through the charting. This is SUUUUPER simple charting. I've looked at whether or not Ifedi has one leg back, as a pass set, or both feet underneath him. Like these two examples.
This is what I found. When Ifedi sets up in a pass set with one leg behind him, or with his feet kind of aligned, but still a bit behind, the Seahawks pass the football over 90% of the time. On the other hand, when Ifedi's feet are aligned, they run the football over 75%.
100% of Seattle's play action attempts came when Ifedi had his feet aligned, which makes sense, since that is when he is faking a run. On 66% of their play action attempts, Ifedi had one hand in the dirt.