Cave--I'm not opposed to moving him out to let others play (although if neither Celestino or Buxton is on the ML roster, I'm not sure if more PA's for Refsnyder is totally worth it). That said, he had a wRC+ above 100 in both 2018 and 2019, and had a serious back injury this year which I'm sure contributed to his terrible numbers. He still has an option left, and with three years of arbitration (which will be very inexpensive), he's not a terrible depth option, until such time as Kiriloff, Larnach, Rooker, Celestino, and Martin are all ready to be everyday big league players.
Simmons--I have no idea why we're not auditioning Polanco and Gordon at short. None.
Donaldson--I don't think it's crazy to believe the market for him might be different in the offseason than it was at the deadline. Also worth noting that eating $40M to move him is more palatable if Miranda has 6 weeks of consistent playing time OPSing .900; sure it's not great, but you save $10M. Given that Donaldson clearly isn't healthy, I have no idea why you wouldn't IL him now, let him rest, and bring him back in September.