So we have Cooper, Aguilar, Kemp, and Diaz competing now for first. This is a great development for Kemp, at least.
FanGraphs ZiPS projections for these four in 2020 (and keep in mind that ZiPS doesn't take into account playing time):
Aguilar 104+, 1.2 WAR
Cooper 98, 0.7
Kemp 95, -0.5