I left Ref off of my analysis because I don't know if he will re-sign. But replacing Duran, Bregman, Devers, Lowe and Toro, with an identical amount of PAs by Anthony, Abreu, Mayer, Casas and Yoshida, changes the outcome of those 1,928 PA from a .793 OPS to a .771 OPS. Given that the 1,928 PAs represent 31.1% of the team PAs, that lower our team OPS by .007.
If we got Marte for Duran, the increase of *team* OPS would be about ten points.