re: Why didn't the other Pac 12 teams run the Washington defense against Leach?

Leach’s biggest problem by far has been KJ Costello. Costello came from a pro style in the Left Coast-12, but that's only part of the problem. Costello telegraphs all of his passes, allowing a defense to draw beads on receivers when he can get it there in time...which has been another problem. He isn't reading the defense at all. He has his go-to, and if not, he dumps it off to the RB in the flat, or underneath linebackers, or goes down....or throws it into coverage anyway.

He's been a train wreck for this offense and wasn't ready. I doubt he'd be suitable if he thought he was ready.

You're going to see an improved product with Will Rogers, if Leach wants a chance to win, or to even score. Rogers is familiar with this scheme and learned with Gardner Minshew. He also has some mobility, unlike KJ. The Vandy game should be a fresh start, the Alabama game doesn't matter right now.