This wasn't that. Though I agree with that assessment of Grantham in general. He's very boom or bust. He'll either confuse and blitz an opponent into submission, or he outsmarts himself and confuses his own guys. This was the opposite of "too much," however.
In this case his theory was sound. LSU's plan for running this year has been to spread you out in 3 and 4 wide sets and run inside zone into the empty boxes. The answer has been to get into the "tite" front and take away the inside zone, destroying LSU's run game the way UCLA did. Teams have of course benefitted from LSU's inability to block literally anybody. Grantham in fact did this, but this time LSU went back to shades of Miles, to a lot of GT Counter looks mixed with a few GY counters. Grantham did some things with different DL slants and such, but the general structure remained the same, and he never got Florida out of that to a different look. Also, LSU blocked way better, and the walk-on TE blocked his ASS off. Grantham just never would get out of what worked for other teams all year, even though LSU was not attacking the way they had all year (well...."attack" is a strong word for LSU's run game this season....)
One thing LSU did that helped was they did a decent job of concealing the direction of the play. If you aren't careful teams can key on your run direction based on your tight end alignment and start run blitzing the path of the back. By mixing in the GY every now and then with the GT staple, and motioning the aforementioned walk-on TE, it helped keep UF honest and not just be static.
But yeah...Florida's defense, at some point, should've tried something other than tite when it became obvious LSU's guys were winning their blocks consistently.