The ATL 777 openings were dependent on pilots bidding off DTW 777. Apparently there were DTW 777FOs who bid away, but no Capts.

The Airline (or Air Line) did not need more 777 pilots. They just needed to move the positions to ATL.

It is not surprising no 777As moved out of DTW. They get paid to DH on the front and back end of their trips, there is no higher paying equipment to go to and there may actually an advantage for them to wait and be displaced...to LAX in the fall.