And yet this last week they held #13 TCU to 17 points, 421 yards, 19 1st downs, 4-13 3rd downs, 155 (avg 4.8) yards rushing> Not great SEC defense level, but good enough to hold TCU in check. UGA's offense is statistically similar in PPG, and plays 'unbalanced football - they're 11th in the country in rushing (263 ypg) but 110th in the country in passing (171 ypg). If OU decided to take the running game away (easier said than done) and make Fromm beat them through the air, I don't know that UGA can score enough to keep up with OK.
I hate to break it to you but that's not a good comparison. Here are some statistical comparisons of the two team's offenses:
Total Offense:
UGA - 37th, 433.6 ypg, 6.75 ypp (13th)
TCU - 52nd, 413.9 ypg, 6.01 ypp (44th)
Scoring Offense:
UGA - 23rd, 34.9 ppg
TCU - 34th, 33.2 ppg
Rushing Offense:
UGA - 11th, 263.54 ypg, 5.80 ypr (10th)
TCU - 52nd, 176.23 ypg, 4.52 ypr (55th)
Passing Offense:
UGA - 110th, 170.1 ypg, 9.1 ypa (8th)
TCU - 58th, 237.7 ypg, 7.9 ypa (37th)
Passing Efficiency:
UGA - 9th, 160.25
TCU - 21st, 150.92
Offensive FEI (Opponent adjusted overall efficiency)
UGA - 4th, 3.55
TCU - 41st, 2.50
TCU runs the ball fairly well for a Big 12 team but they are very much a pass-first team and aren't a power rushing team. And, while Georgia may not pass nearly as often as TCU, the Bulldogs are actually much more efficient than the Horned Frogs. In the OFEI ratings, which is probably the best statistical comparison that exists, the two offenses aren't really close, at all. In fact, the only two offenses similar to Georgia's in OFEI that Oklahoma has faced are Oklahoma State, at 2nd, and Ohio State, at 3rd. Okie Lite lit them up big time and the Buckeyes, well, they're quite a bit Jekyll and Hyde all on their own so it's hard to say how much of that game was OU's Defense playing well versus OSU's Offense playing poorly.
For reference, here are all of the SEC and Big 12 teams in the Top 50 of OFEI:
1. Oklahoma
2. Oklahoma State
4. Georgia
6. Alabama
15. Barn
20. Missouri
26. LSU
30. West Virginia
34. Iowa State
36. Mississippi State
38. Texas Tech
41. TCU
42. Arkansas
46. Ole Miss
48. Vanderbilt
Oklahoma simply hasn't faced an offense as consistently good overall and at running the ball as the one they'll see in Pasadena.
The only offenses they faced with any real semblance of a power running game were Ohio State and Kansas State. Kansas State racked up 268 yards rushing at 6.4 yards per rush. Ohio State, as poorly as they played on Offense, managed to rush for 167 yards at 4.9 yards per rush. However, that's a bit misleading as most of their runs were by J.T. Barrett and a large number of those were scrambles on designed passing plays plus three sacks. The Buckeyes' running backs rushed only 16 times for 101 yards - an average of 6.3 yards per rush. In hindsight, Ohio State's game-plan probably hurt them more than anything else against Oklahoma.
As for Oklahoma's rushing defense, look at it in comparison to Big 12 Offenses. The Big 12, as a whole, averaged 155.25 yards per game with an average 4.24 yards per rush. In Big 12 play, Oklahoma averaged giving up 139.70 yards per game with an average 4.00 yards per rush - putting them right smack dab at "Average" for a Big 12 Defense.
Oklahoma will have to be much, much better than average to really slow down Georgia's Offense.