If you look at the 2 DTs, they are both wide of the OGs outside shoulder, leaving the middle completely bare. Im assuming its Suh, whose gap should be between the RG and RT (B gap) and the other DT is the aforementioned AD in the other B gap. That leaves Brockers and Fowler in the C gaps (tackles to TE or Sideline) and Littleton and Barron in the gaps between the OGs and the OC, or the 2 A gaps.
Donald fills his gap (he wins easily) but the run is in the left A gap (where Littleton or Barron should be) and he is free and clear. This happens alot.
And it is very uncharacteristic of Phillips defenses...
Don't waste your time looking back, you're not going that way. - Ragnar Lothbrok