Trading Dalbec, who now looks pretty competent at 1b and is hitting well, makes no sense, especially given his age/retainability. The infield of Devers, Bogaerts, Iglesias/Arroyo, and Dalbec looks pretty solid to me--decent fielding, good hitting.
I just think Shwarber is a better bat than Verdugo and don't mind giving up some defense in LF. That said, Verdugo has been handy as the backup centerfielder and is younger and a lot less expensive than Schwarber. Yet again, Schwarber is 5 years younger than JDM and a good choice to take over at DH.