I agree there is a trend with Orlando not doing well against spread offenses and he hasn't done enough to modify his play calling or understanding his personnel weaknesses. But, along the lines of how difficult it is to defend competent spread attacks, consider the following.
LSU has more talent on defense, more experience, and a highly regarded coordinator in Aranda.
The only "stop" LSU got on defense in the second half was when we chose to kick a FG on 4th and 9. 3 plays earlier it was a LSU blitz on 1st down that got Texas behind the chains and led to the "stop".
The previous 3 TD drives by Texas in the second half did not have a sack by LSU.
The 3 and out with less than 2 minutes in the first half had a sack on 3rd down with a 4 man rush. There was a stunt and the end came free up the middle.
I'm not going to defend the blitz on the 3rd and 17, but I don't think it is crazy to say that against a competent spread attack that drives generally only end without a score if you get pressure. I think the Texas offense itself is a great example of how you can march down the field if given 3 tries to execute the offense and get 10 yards. Orgeron admitted that if we got the ball back they wouldn't have been able to stop us.
I think the solution is to look at how we are getting pressure, or trying and failing to get pressure. If you blitz the nickel and don't have someone else fill the gap a competent QB/WR will hit the hot route. If a safety is getting stonewalled maybe you trade off exotic blitzes from different directions with a bigger stronger guy.