Despite their listed height Casey looks the same height if not shorter than Prince. Height alone does not make a good or bad first basemen but that definitely was one of Prince's defensive liabilities and Casey will have the same deficiency. Casey has little mobility which will show itself more at first base when dealing with fielding balls while holding on runners and plays where the pitcher has to cover first. If we were to put Casey at first and Gamel at third Casey would have to deal with bad throws from Weeks and Gamel. It took Prince long enough to learn how to scoop and come off the base and we'll go through the same thing with Casey. Ultimately, and this is something I have said many times, we need to stop putting our worst defenders at first just because we have no other options. It's not just a first base problem it's an organizational problem. LaPorta moved to first, Lawrie moved to where ever he will end up, Gamel moved to where ever he will end up, Braun to the outfield, Hart moved around.