Obviously as a first baseman your value potential is limited. Also by the fact that he doesn't look like a great defender. His K-rate in the minors this year dipped to around 15% from 20-ish prior, which is average. All I care about is that he's a good hitter, which he is. Comparables include Chase Utley, Troy Tulowitzki, Edwin Encarnacion and Moises Sierra.
Weird that a Rizzbro such as yourself is so down on Bird when he's a better prospect that Anthony was at this point and has the same question marks.