How has Peña performed to this point, and what can we expect in the postseason?

Peña is a bit of a mystery to me still. His start to the season was inspiring, things have mellowed out, and I’ve seen a few defensive concerns. Seems like if we got the Peña who started the season, we’ll be golden in the post season – but I’m feel uneasy about it sometimes. What are y’all’s thoughts?