Pena is horrible. He has taken 2 fastballs right down the middle (1 in each AB) yet swings at every changeup Glavine throws outside and in the dirt.
Exactly my point earlier. He just makes guesswork out of every pitch. In the rare event that he actually does display a modicum of pitch recognition in a count, he usually negates that work by completely misjudging pitches later in the count.