Dalbec is interesting , if nothing else. His defense appears to rate poorly at 1B, 3B should be no easier for him. But if someone told you about a 6'-4" RH hitter with power to play 81 times at Fenway , hitting .240 with 25 HR's and 80 rbi's plus with favorable team budget control for multiple years as a bonus , you would likely take a hard look.
With some D work, and better plate discipline which there are some signs of, Dalbec can/will hold the fort while determining if Casas is the future answer. Possibly a platooner with Schwarber (if signed) , and a PH when needed.