In the Lukes vs Sanchez thing, both are garbage against lhp. Sanchez better vs RHP with more thump. Lukes so much better defensively and on the basepaths its not particularly close. So its a situation of pick which strength you want more and deal with the resulting weakness as best you can.
The only way i envision Springer coming back is if Atkins pullsoff a miracle and sonehow moves Santander. Or maybe they get lucky and he's just injured to the point where he has to live out the contract on the 60 day IL.