Ronny Paulino is not popular

Looks like we can add Johnny Estrada to the list of mediocre to bad catchers that the Pirates appear to be interested in having behind the dish next year instead of Ronny Paulino. Off the top of my head, that makes Estrada, Michael Barrett, and Kelly Shoppach that the Pirates have at least expressed and interest in this winter, with the PG also reporting they may target Miguel Olivo or Damian Miller as well. Clearly, Paulino is pretty low on someone's list in the new front office because no team targets this many crappy/semi-crappy catchers without a reason. On one hand, I know how awful Paulino was last year. On the other, would any of these guys be a real improvement?