Been away for a few days, but man what is going on in here? Why would you move Zimmerman to first when he would be a barely league average bat at 1st? Especially if you have someone like T-Mo who is still young enough and has the potential of being a league plus bat with home runs, and may also provide fairly good average with acceptable amounts (read high) of strikeouts?
Yes Zimmerman has issues throwing the ball. Remember that in 2010 he was throwing to Dunn all season. I understand that if Zimm throws a bad ball that is called as an error because it pulls a guy of the bag or it's over his head or low, but honestly how much of Adam Dunn-ness gets factored in here? Zimm also gets to more balls than your league average 3B, and he and Wright are the only guys that really make those insane plays. Wright just throws better.
Cliff notes version here is until you know that Rendon provides better defense and a MLB ready bat at 3B, there is no point to move Zimmerman over there when you have options internally with Moore or Morse. My bet is on trying to resign LaRoche and trading Morse. If you don't sign LaRoche, I'd still trade LaRoche and play Moore everyday at 1st.
Team needs pitching. Get more of that.