I don't think keeping Pablo around is about "being a nice guy."
It's about making a long-lasting financial decision on paying a guy $19M to play elsewhere. If there is a sliver of hope he can regain some sort of value to this team, even if it is as a platoon DH and back-up corner IF'er in 2018, it might be worth keeping him around a while longer to see if some sort of revitalization occurs.
I doubt it happens.
I'm pretty keeping a roster spot for a platoon DH is not the best way to fill out a 25 man roster.
But, $19M is a lot of money.
We payed Young $6.5M and Moreland $5.5M to be platoon players. They both ended up taking on a role vs off-handed pitchers.
Imagine this, we DFA Pablo, and we go with Devers, Travis and Swihart/Hernandez as replacements for Moreland, Young and Holt. We make HRam the DH, Travis the FT firstbaseman and Devers the FT 3Bman. What if any of these guys struggle or get hurt, we might end up having to sign a guy to play 3B, 1B or DH-- all positions Pablo could conceivably play-- and be paying $19M for Pablo + whatever we have to pay the next Moreland/Young type. Now, we're up to $25M combined cost.
I truly think that if Sox management was 100% sure Pablo was toast, he'd be gone, and Marrero would still be on the 25 man roster giving us the added depth we need.
They must still have some sliver of hope, or they don't see Marrero as an upgrade over Pablo, even if it does not seem well founded right now.