Closers have long been terribly easy to trade for in MLBTS so not surprised by the Walker deals. You used to be able to get Mason Miller for 2-3 bad C potential prospects but in real life, he went for multiple top prospects including the number 3-5 prospect in the game pending which service you're looking at (De Fries is the SS prospect)

Cubs with Guardians

LF Kwan 1 year remaining POT B 86 for SP Rivera POT B 60 + POT C Roccaforte + POT C SS Vera 63

Red Sox with Orioles

C Rutschman POT B 88 for 2B Pohl POT A 50 + CF POT C Payne 62 + C POT C Brannon 62

Everytime 1 Year Contract for 7 Year Contract(all low ovr Player)

Cubs with Giants

CP POT B 85 Ryan Walker for 2B POT C 61 Crisantes
3 Year remaining vs. 7 Year Remaining

Athletics with Rays

SP POT B 83 McClanan(1 Year) for CF POT B 48 Fukodome(again 7 year Remaining)
‐--------‐----------
Red Sox with Giants

SS Adames 89 (5 Year )
RF Hoo Lee 81(4 Years)
RP Miller 71
RP Beck 66

for:

SS Morales 64
2B Johnson 67
CF Sullivan 69
SP Echavarria 68

The team and their standing (projected playoff team vs losing 100 games, etc) have a lot to do with it. You might have a 91 rating who will be entering free agency so that team would trade them off for three 62 types to help from losing them for nothing/draft pick. The potential on the 62s will be important as well. If they are an A or B and then team with the 91 is not good then they could be playing for the future.

I say that all while also saying the logic has been improved for this year but is far from perfect.