@5, you must not read very many baseball blogs. USSM doesn't have much math at all, though they rely heavily on the work of those that do, particularly Fangraphs and Tangotiger. What they specialize in is the implications of that research, not the calculations themselves (which are really boring in themselves). What's interesting isn't "math" (mostly just +, -, /, and *) but how to think about problems in baseball. Dave Cameron's the big stat guy at USSM, anyways, and excels at it; Derek's main contribution is writing excellence and funny.
Yeah, that's exactly like Adam Lambert being secretly gay before the Rolling Stone piece.