I think it’s very possible Mata makes his debut in the 2020 season, but hopefully not until July at the earliest.
I see Dalbec as either trade bait or taking over 3b with Devers moving to 1b. A big part of Dalbec’s game is his defense at 3b, which will be a positive contribution even if he struggles offensively. I doubt Chatham is on the radar. The Sox already have Marco Hernandez and Tzu-Wei Lin, both of whom are capable and more experienced utility players, and Chatham doesn’t need to be added to the 40 man roster yet
Duran doesn’t need to be added to the 40 man roster, either. And has only been playing outfield for one year. While the Sox are likely to need outfielders, I’m not sure Duran is a candidate yet. Or if he is ahead of Marcus Wilson, who has more outfield experience.
I don’t like Dalbec (again, good defense wasted at DH) or Moreland for a DH role. The aging Encarnacion might be a good short term DH, and has always expressed a desire to come to Boston and succeed fellow countryman Ortiz at DH. He might even come at relative bargain price...