We haven't been able to catch the little critter(s) that is munching on the outer leaves. We're not sure if it's cabbage moth larvae. Still under investigation.
One of our organic pest control methods is to catch white cabbage moths in a net. (They lay eggs on cabbage, broccoli, most brasicas. Then the larvae munch away.) Cabbage moth score: Sara - 6; Doug - 4; and Char - 3