Watching Warner's Breakdown of the 49ers offense, one thing that jumped out was the defenses eyes deceiving them. All that motion with interchangeable personnel assignments had the Seahawks, in particular, out of position in coverage and repeatedly abandoning contain on the edge. The Cowboys are also very susceptible to overreaction with movement, especially on the edges and in coverage.
Quinn will have a good plan in place for Kyle Shanahan's scheme. He has probably been working on it since the Titans game. The Cowboys D won't get away with undisciplined play Sunday, the talent on the 49ers will exploit them badly. Having success against SF on 1st down will be huge for the defense and that will put more pressure on Purdy to make plays and allow the Cowboys defense to do what they do best...pressure the QB.
Too much emotion won't be effective in this one.