I'm actually pretty cool with Zimmerman moving to first base. He's such a good defender that he can adjust anywhere, and we all know his glove is phenomenal. I'm cool with Rendon moving there, too. Either way, I think they find a way to keep both around and productive, should Rendon force the issue.
Zimmerman has been one of the top 3 defensive 3B in the game since his debut. Arguably the best over that time.
You...don't...move...that...kind...of...defensive
...value...to...first...base. Period.