Calling Space Coyote and other coaches: please help me understand three things

During the game there were two plays I did not understand the blocking design of at all. I'm hoping someone who understands the nuances of the game can help. Additionally, there is a general question I have. 1) against a four man rush, the entire offensive line zone blocked three defenders to the left and left Fitz one-on-one on the back side with a DE (Greggory, he of the three sacks). Obviously Fitz got abused and a sack ensued. Is there a blocking scheme which purposely says five O-lineman will block three players and leave a RB to go one on one in space? Why would Schofield not help Fitz and let the other four lineman handle three defensive lineman? 2) on a max protect Gardner sprinted to the right. Again zone blocking. The C, RG, RT, TE, and RB all zone blocked to the right. Lewan and Bosch zone blocked going left. That seems bad enough, what happened next is what I really don't get. Lewan barely touched the DE as if he was passing him off to Bosch, Bosch did the same thing, except everyone else who could block was all moving to the right. The DE rushed in for the sack because both routes were covered. Why would two players zone block to the opposite direction of a sprint roll out pass and then both pass off the one guy they are responsible for? I double checked, they were not setting up for a screen because Fitz was fully engaged in zone blocking to the right. 3) this is not play specific. Everyone is well aware of Hoke's feelings regarding Nebraska's claim of knowing what would be run based on tendencies. Forget the specific play call and packages, has anyone seen any evidence that Michigan is somehow tipping its plays? Is there something the O-line is doing which let's the defense know it will be a run to a specific gap before the ball is even snapped? I get guessing run vs. pass but it seemed as though Nebraska's whole defense knew exactly where to run to as well. I appreciate anyone with football intelligence to chime in.