Sounds like this has been resolved before it became a real issue but the mere thought of moving David off 3rd as a way to get Murphy back to his “natural position” is preposterous.
Murphy isn’t a good defensive player - period. Moving him back to 3rd, a position he has played regularly in YEARS, and expecting him to be even serviceable is a reach.
Luckily the Alderson regime is too savvy to allow this to happen.
I’m just sayin’.