The O-line is definitely in flux. His comments yesterday seem to indicate that they will look at Moton at left if Moton feels comfortable there and followed that the value diff between L and R aren't as stark because there are now great right side rushers.
This could be an open question for a while.
Just speculation here, but I think this staff believes Moton is a LT but Moton has been playing RT so long that he's very comfortable there and is hesitant to make the switch. They're trying to convince him to give it a legit go and what better time to do that than now while Erving is out anyway?