The Ags hung in there against some of Texas' world-beater teams in the past - including VY and Colt led teams. They play their best against Texas at Kyle, so nothing's guaranteed.
Yes, sometimes the Texas OL has a brain cramp. More recently, though, is we get last season's Quinn who had to double check every read he made. He was almost always correct initially, but the extra time he took to verify it would ruin a play. It seems defensive coordinators noticed that, and started throwing naked blitzes at him. Those blitzes would leave hot receivers running free for almost certain TDs if they got the ball. The DCs were counting on Quinn to take that extra second to "be sure", and thus self-sack. UGA did it over and over again (in addition to having a defense capable of overwhelming the OL by itself).
Sark's plays pull the defense apart. It frustrates me when fans complain about "run the ball" and such, because each formation has a run and a pass built in. The offense does what the defense is weak against. Currently, defenses are trying to stack against the run, so there's lots of passing. Hopefully, after Saturday, DCs will start to respect Quinn again and vary their alignments.