A little surprised to see this take from GreenSox, the lover of fringe prospects.
Frare and Ruiz are going no where. Frare still has 2 options and Ruiz 1. Both have great arms, and while they both were terrible in 19, they are good AAA insurance.
Palka is a dead goose - he'll be gone soon.
Medeiros is probably a coin flip at best to survive the offseason. Profiles decently as a lefty reliever, and did OK once transition to that role full time in 19, but LOOGYs are less valuable now with the new rules, and he's behind Bummer, Fry and Frare. So going to be tough for him him to crack the MLB pen, but he does have 2 options, so that helps.
Vieira is out of options, so he's probably the likeliest to go of this crew after Palka, and the fact that the Sox didn't call him up in August probably shows how they feel about him. But he did pass the first round of cuts, so they clearly like him enough to keep him around for now. His arm is electric.
Oh and Mercedes....no one is going to take this guy in the R5 draft. Keeping him off the 40 man is fine, and probably the easiest way to retain him for now.