BA on catching - passed balls

I don't know if this has been posted elsewhere, but it is an interesting article on BA (the free part) about which minor league catchers are best at keeping balls in front of them. 

http://www.baseballamerica.com/blog/prospects/?p=1835

Even has this snazzy paragraph that I like

While pitchers and official scorers throw noise into the data, the catchers themselves might even muddy things up by creating a selection bias. If a catcher is excellent at blocking balls in the dirt, his pitchers might feel more comfortable throwing more pitches with downward action low and perhaps even beneath the strike zone with runners on base. But if a pitcher knows his catcher isn’t the most adept at blocking, maybe he doesn’t throw as many of those pitches with men on, giving the worse defensive catcher fewer opportunities to commit a passed ball.

The last thing I want is for our already sketchy Rangers pitchers to be afraid to throw something in the dirt for fear of the ball rolling to the backstop.  Because fear to throw low means that the ball may well end up in the home run porch.  Pitching low and occasionally in the dirt may be a necessity in RBiA.

So how do our vaunted catcher prospects stack up?  Well, obviously our posterboy of catching defense does well:  Taylor Teagarden is a great #3 on the list in all of the minors,

But more surpising is #21 on their list of 54 catchers:  Max Ramirez.   Not bad that he shows up as relatively average at this aspect of catching.  Unfortunately in their other article on throwing out runners, MaxRam was a scary 49 out of 55.  But I'm beginning to wonder if his catching is quite as bad as CW, or if he is just mediocre.