If Mauer did retire, and assuming Park and/or Vargas weren't traded, I'd let Sano, Vargas, and Park duke it out in spring training. At this point, I'd pick Vargas to win the 1B job based on defense, Sano to DH (somewhat unfortunately) and unless Park shows great improvement, I'd send him back to Rochester or try to trade him. I really like the Justin Turner idea though. That would get my approval.