I don't pretend to be the defensive stat wizard, but Santander and Springer both had -9.7 DEF in 2024.
2024 OAA: Springer was -1, Santander was -2
2024 FRV: Springer was -4, Santander was -3
2024 UZR: Springer was -4.3, Santander was +1.4
2024 Arm Value: Springer was -3 (3rd percentile), Santander was -1 (23rd percentile)
2025 OAA/FRV: Springer was -6/-8 in only 436 innings, Santander was -1/-2 in only 181 innings
I think they both suck defensively. I'd rather keep Springers bat in the lineup all game myself.