We'll get more into that next week, but Heuerman was responsible for that guy inside, due to his alignment. Braxton was reading the OLB (I think his number is 41) who comes late into the picture after being held by Miller.
Hyde did a great job of reading that backside gap as the defense slanted that way. This is another area we'll cover in this series, but if the defender is already working that way, the line will ride them all the way sideways and let the back cut back against the grain. 34 was a master at not only knowing when and where to cut, but not dancing and losing his momentum along the way.