Oregon hasn't won ****. When they win a ring with that gimmick, let me know. I want a ring, not some flashy offense that can't win the big one.
Not really sure you've seen a lot of Oregon. Yes, they are "high octane" but that's mainly because of the tempo. That O is based on inside running. They run inside a lot. They did under Kelly anyway, didn't see a lot of them last year.
A typical drive would be 4 yard run, to the line, 5 yard run, to the line, 4 yard run, to the line, then POP 26 yard run, to the line, PA TD. I'm just giving a quick example. Kelly would run James and Barner up the gut several plays in a row to set up other things or to tire the D out.
As far as spread and tempo being a gimmick, I don't think Saban would be using player safety as an excuse to slow down O's if it was a gimmick. If Saban is scared, I'm on board.