Who knows of the Gazans that snitched to the IDF, mossad, and/or secretly did things to help the hostages. Obviously these stories can't come out for a long while. But time will tell. Hopefully. (Although to be honest, I'm not too confident)
The IDF has lots of Human Intel on the ground. You won't hear about them. Some have been blackmailed to collaborate with the IDF, it's possible that others do it for pure motives.
That being said, have there been ANY public condemnations from the Arab world (or from the UN, or ICRC) to the murder in captivity of Shiri Bibas and her kids, or any of the other hostages who were murdered in captivity?