Cubs catchers are terrible at defense

I don't know if you've been paying attention or not, but if you have, you've noticed how terrible the two Cubs catchers are on defense. Dioner Navarro may be the worst defensive catcher I've ever seen. Welington Castillo isn't far behind.

I was curious how many times per game these guys have screwed up. Wild pitches, passed balls and errors seem to be the best way to look at the number of screw-ups. There are many other parts to catcher and most of them are difficult to calculate. Pitch framing is one of the catcher's jobs and I can't possibly comment on that.

I see the number of times they screw up and that's about it. If you're a fan who believes he has a magic eye and can spot pitch framing, good for you. I don't believe you, but good for you.

Here is a list of the catchers with at least 50 innings caught so far this year and the number of times per game they've screwed up.

Name Fuck-ups Per Game
Dioner Navarro 1.59
Carlos Santana 1.02
Henry Blanco 0.90
John Baker 0.87
Jarrod Saltalamacchia 0.85
Wilson Ramos 0.80
Wilin Rosario 0.79
Hector Gimenez 0.75
Welington Castillo 0.74
Gerald Laird 0.69
J.P. Arencibia 0.69
Chris Iannetta 0.67
Jesus Montero 0.66
Ryan Doumit 0.65
Yorvit Torrealba 0.64
Alex Avila 0.64
John Jaso 0.63
Jason Castro 0.62
A.J. Ellis 0.61
Michael McKenry 0.61
Chris Stewart 0.60
Salvador Perez 0.58
Kelly Shoppach 0.55
John Buck 0.53
Russell Martin 0.51
Tyler Flowers 0.51
Rob Brantly 0.47
Nick Hundley 0.47
Miguel Olivo 0.47
Martin Maldonado 0.47
Francisco Cervelli 0.46
Carlos Corporan 0.45
Jose Molina 0.43
Joe Mauer 0.43
Matt Wieters 0.41
Jonathan Lucroy 0.39
A.J. Pierzynski 0.38
Hank Conger 0.36
Miguel Montero 0.36
Derek Norris 0.36
David Ross 0.34
Ryan Hanigan 0.34
Yadier Molina 0.33
Evan Gattis 0.33
Brayan Pena 0.32
Buster Posey 0.32
Humberto Quintero 0.32
Jose Lobaton 0.31
Geovany Soto 0.29
Erik Kratz 0.26
Devin Mesoraco 0.25
Yan Gomes 0.24
Kurt Suzuki 0.20
Carlos Ruiz 0.17

So yeah, these guys are screwing up a lot. Among catchers, the Cubs have more errors than any other team, more wild pitches and have allowed the 3rd most passed balls.

I asked this question at the time, but maybe someone can give me an answer. Why did the Cubs pay $1.75 million for a terrible back-up catcher?

Castillo has been better than average at throwing runners out, but they're running on him regularly. The Cubs as a team have had more stolen base attempts against them than any other team.