I think that's exactly what we're seeing. There is no need to play D past 10 yards as the Bills rarely attack that far down the field and don't have the outside WRs to do so, especially against good man CBs. Bills also rarely have packages with two boundary WRs, so further condenses the D toward the ball and LOS. 
 
	 
 
	You could say on any given play there are 9-10 defensive players near the LOS. Add in some creative blitz calls and that's a rough day for the Oline and Allen.