what I meant by universal DH is extending the DH to the NL, which I take it is likely.  Not a full time DH.  Some of that time should go to Yadi against righties.  At $1 million, RZ can play against most LHP either at DH or 1st. 

Historically, Zimm hits RHP and LHP better than Yadiel.
Career:
RHP:.267   .326   .456
LHP: .310   .386   .530

Though last year Zimm hit only .207 against RHP.  Bell is a better platoon partner than Yadiel for Zimmerman.