Personally, I give more consideration to a pitcher's ERC# and his history, regardless of his BB/9#, because there are tons of pitchers in the sim who walk very few batters, but who get clobbered bigtime. I'd gladly take a pitcher with sub 2.00 ERC# who walks more than 3 batters per 9 innings, over a pitcher with a 2.40 ERC# who walks less than one batter per 9 innings.