err, you said defenses, but guess who defenses play against? Offenses, and Texas played a much weaker set of offenses, that's a fact. It inflates their defensive ranking.
Umm no you tried to pass of a misreading into something else. The PAC 10 has terrible defenses, and guess who the offenses play against, according to your way of turning things around? As such it inflates your Offensive stats. Unless its somehow different for the Pac 10?