I feel the small window at the rear of the bomb bay was to insure all ordance had actually been droped and was not hung up.
All ordance had this anoying habit of getting hung up once in a while. It was standard procedure when something got hung up to go thru all kinds of dives, turns etc., to try to dislodge the weapon. Captain's of carriers demanded that no plane was to land with hung up ordance and if the pilot could not dislodge the ordance, then they took a dip. This in itself was doubly dangerous as the force of a sea landing could cause the ordance to go boom.
The show on the Avenger had an interview with a vet who flew an Avenger in WW2 and when his torpedo got hung up, he attacked the Japanese cruiser a second time by himself (his flight droped their torpedo's and went home). Not a good feeling with every AA gun trying to get him alone. The torpedo failed a second time and he went back to his carrier and only with repeated assurances that the torpedo was not hung up but was held fast was he allowed to land on the carrier.
The Norton bombsight was a vertical bombsight, no use at an angle as mounted in the radio compartment. In addition the radio operator would not be needed as a bombadier when the ordance was a torpedo. The plane would be flying too low to see anything. I can see a Bombadier being used with bombs and depth charges so I guess I'll concede the point.
By the way, the show did talk about Poppa Bush being shot down while level bombing a Japanese radar station and AA brought him down and killed his crew. The film of him actually being rescued by one of our subs and clearly seeing Poppa is sure inspiring. A covering Corsair actually dove on and destroyed a Japanese patrol boat trying to get to Poppa. What ifs abound.
TTT
Sometimes I am the windshield, sometimes, I am the bug.