I think Merrifield would be a fine addition, but I think his BTV is too high. Duffy shows very little promise of returning to form.
I don't know enough about Hasely or Thomas to have an opinion, but I do think Chavis is over-valued.
I've seen rumors that Pittsburgh is looking to deal Musgrove or Taillon and have mentioned Adam Frazier (2B) and Josh Bell (1B) as possible pieces.
Fangraphs has Frazier as a slight plus defender at 2B, since 2017, and he's got a career OPS at about .750. Bell had a great year in 2019. I'd hate to part with Dalbec, but for these three, I'd do it (other would be needed). I've mentioned including Polanco in the deal to lessen the return needed, but he doesn't really fit in with our roster, unless we sell low & trade Beni. (one could counter that Pitt is selling low on Bell, as his BTV is "0".
Bell has one arb year left, after this and is projected to make $6M, this year- which is too much for Pitt. Frazier has one arb year left is may make about $4M, this year- again, too much for Pitt. Polanco has one year left at $11.6M. Taillon, of course, is the prize. He also has one arb year left.
In theory, I'd like to see us trade for a player or players with more than just 2 years of team control, but 2 guys with 2 years is nice. Downs should be ready at 2B in 2 years. Casas will be close at 1B.
The BTV site accepted this deal, but I can't see how Pitt would do it:
Chavis (7.5) + Chatham (4.9)
for
Taillon (20.3), Frazier (4.0), Bell (0.0) & Planaco (-13.5)
They also accepted Chavis & Beni for the same.
(I'd even add Groome or Ward to any of the deals above. I'd probably give Dalbec & Chatham for those 4.)
If we drop Polanco, this gets the deal done on BTV:
Duran, Chavis & Chatham
for
Taillon, Frazier & Bell
We fill 2 needs and get 1B insurance for Dalbec without losing a big name player or prospect (sorry Duran fans).
This might be a more realistic trade from Pitt's point of view 9all accepted on BTV):
Dalbec, Chatham & Groome
for
Taillon, Frazier and Bell
(I'd even add Beni for Polanco to sweeten the deal for Pitt, but BTV denies that trade. It even denies that deal swapping out Chavis for Dalbec. It makes Pitt give $3M to BOS to accept it.)