re: Baylor has a better running game than LSU

Big 12 focuses on offense, not defense. It's a practical matter, they are taking in a lot of Texas area players, and there is more focus in high schools to run potent offenses. Lots of 7 on 7 stuff going on there. Technique and "systems" are a lot more developed.

SEC ball is more physical in nature, the local teams are physically oriented in their styles. We don't have (in La at least) near the emphasis on offensive technique in high schools, it's more a matter of trying to out-athlete each other.

Watch highlights of Fournette, Guice, Dupre etc from high school. They aren't running fancy plays, they are physically beating the other team due to being superior athletes.
Then go watch any number of these Texas schools, and the QBs they put out. Guys are finely honed in what they do, even if they aren't the best physical talents.

Your comparison of LSU and Baylor vs Texas Tech actually shows that point. They had comparable numbers vs a common opponent, yet nobody would say that LSU has near the "high scoring" reputation of Baylor. LSU didn't try to trick TT at all, they basically gave away the play before the snap, and still ran all over them.