wu, your words have called a Biblical story to my mind.
Jesus was going about curing the lame and the blind and the lepers. There was a man who was a paralytic and he wasn’t able to go on his own to seek Jesus for a healing. So his friends took the initiative for him. They made a hole in the roof and lowered his pallet until he was placed at Jesus’ feet. It was there that he was cured.
It was his friends who were faithful and cared for him who made it possible for him to meet Jesus and to be cured.
His friends were intercessors for him.
The same can be said for the story of the centurion who sent his foot soldier, as an intercessor, to Jesus to ask for a cure for his daughter.
Christians do things for each other all the time and they are exhorted by the scripture to do so.
If you are somehow trying to use your examples to prove that these people asked for help from beyond the grave, there is no inkling in your examples that this is true.