Usually, I'd worry about messing with Devers by moving him, but the kid seems to not be fazed by anything.
Apparently Dalbec is already a plus defender at 3B, so the switch makes sense, but I'd hold off until we're sure Dalbec's offense is for real. Let's see how he adjusts to pitchers adjusting to him.
It might not hurt to give Devers some reps at 1B this winter and next spring, but I also wouldn't want to mess with his growth at 3B. He's shown extended periods of plus defense there. He's still young enough to smooth over the bumps.
It's a tough choice,