I love this forum and I don't argue with people because I don't want to get banned. I attempt to explain things.
You asked why Perez has a lower blocking attribute than Posey. I explained blocking is about balls in the dirt. A pitch in the dirt which allows the runner to advance is not a passed ball, it is a wild pitch.
Innings for Posey in 2012-2014 at Catcher 2933/82 wild pitches = .0279
Innings for Perez in 2012-2014 at Catcher 3016/127 wild pitches = .0421
Posey is better at preventing wild pitches. I'm not a developer but I believe this explains why Posey has a better blocking attribute than Perez.

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