Zim's war numbers are so much lower than Rendon. Zimmerman's offensive numbers look arguably a little better. Is that all because of fielding position?
Zimm could never play 3rd again, have you seen him throw lately? Rendon could easily play 1st, but he is capable of doing far more than Zimm now in the field.
Zimm at one time was an excellent 3rd baseman but his shoulder is shot.