Coffman,
the credit (or blame) for drop accuracy is or was in my time strictly due to the Navigator. One of them hopefully will be along soon to explain CARP, SAFT
Density Altitude and other parts of the black art of airdrop accuracy. We the loadmasters merely commented on the proceedings unless on certain extracted drops we had to use the extractor emergency release handle. This only occurred when there was an electrical malfunction or the co pilot forgot his lines and did not push the button at the 'green on' call. On a real emergency it could get very busy down the back !
Unlike the Hastings, Beverley or Argosy the Herc did not have a dedicated supply aimer's position, the Nav did his job standing,or crouching behind the Co.