I posed the question in reply #71 to Dave Cameron today in his chat. Below is the exchange:
http://www.fangraphs.com/blogs/fangraphs-chat-42413/
Cameron is on to something. A quick look at DE's O-Swing% from 2011 - 2013 shows it has gone from 32% to 40.5% to 46.1%, while the O-contact has gone from 61.6% to 55% to 60%. In other words, his best offensive year, 2011, he was swinging at a lot fewer out of strike zone pitches, while now he is not only swinging at more than last year, but he is also making more contact. That helps explain more dribblers and pops.
I like your stats. What it tells me is that Espinosa has focused on catching up to a lot of pitches, but he is still a very undisciplined hitter. He is trying to be Vlad with how much he swings at pitches outside the zone.
Also, can someone change the thread title to Benchpinosa?