I read the article, and I see that the Cubs have more in-zone balls than any other team. I just don't follow why this is completely attributable to something as nebulous as framing. Yes, there is some (weak) correlation between this year's numbers and last year's, but the range is just a matter of +/- 2 or 3 called strikes per game. Certain pitchers get strikes others don't get (see ConstableRabbit's post). Certain hitters get balls others don't get. Certain counts get calls others don't get (can't recall the link, but it has been demonstrated that strike zones swell on 3-0 and shrink on 0-2). It sucks for the Cubs (so far), but I don't see sufficient causal evidence to pillory Castillo.