So, in looking for a scouting report I basically came away with nothing. To be honest, I'm not all that surprised. Because he's a converted 3B, he probably has been some what over looked and may be under valued. He's supposedly got a decent arm but 3B > C isn't a very typical switch so he may take a little while to learn catching though he's been doing in for 2-3 years now I believe so he could be farther along. Defense in general is hard to get a feel for via minor league numbers and C is the worst because you have framing and all that jazz. Only other thing I gleaned from reading about him is he moves better than most catches as a former 3B though I'm not sure that really comes into play here.
Regardless, given the total lack of depth the cubs have at C and the fact he's raking in AA as a hitter makes him worth stashing. Also, while 3B > C is some what odd, 2B > C isn't that rare and vice versa. For example if memory serves, Craig Biggio was originally a C when being brought up. So 3B > C isn't *that* crazy.