Through about 4/17, espinosa's K% was below 25%. His walks rate was pretty good, too. Less than 2:1 K:BB. I'll look up thread and link the post where I pulled that {Edit - look at replies #2 and #7 on page 1 of this thread}. The problem was, his power completely disappeared, his contact was not dropping in, and his average stunk.
After that, he started hacking more, going back to his batting style from last year. From that time on, when he did make contact, it started dropping in more, so his BABIP is now back to last year (a few of us guessed this would happen when he stopped trying to be a #2 hitter and stopped trying to take pitches to make up for the leadoff guy's approach). The problem is, the K% shot up, so now the season number is 31.7%, he is walking less, and he is not making enough contact to have a respectable average or OBP. Additionally, the power looks like the 2d half of last year, when he was having trouble.
He was rushed a bit, with only 2 full seasons in the minors, and probably could have used another year in the minors to figure out how to make more regular contact without costing power. It is strange to say this, but the longer he remains in the majors, it seems the hole he's digging gets deeper, and he is unlearning things.