I think this was due to a lack of communication with he and Stringham. OL are taught to pick up the inside gap and there were a few plays were Stringham didn't help with his inside gap and Fusi picked up his guy leaving a 2 yard gap open for the LB coming on the delayed blitz to get through.Fusi also didn't do as well sealing off his block on the run with the NT making a couple tackles on off-tackle runs.
I think a lot of this was due to fatigue because there were less fresh legs in the rotation. If you look at the post again I just updated with a summary of my thoughts on both the offense and defense.