You got the documentation on that?
The examination documents were seen by the lawyers. So were photos of the inside of Sheila's hands showing them free of blood. So were photos of the floor under the Bible showing the Bible sat on her pool of blood. Leon MacDOnnell saw such photo and he said the Bible was placed in such blood after she was dead. He saw the same photo you did plus more and he didn't assess the blood stain to be a palm print.
If it had been assessed as a palm print there would be documents noting it and they would have tried to figure out who's blood it was and who's print it was. They assumed it was Sheila's blood because it was resting in her blood.
The COA decision noted it was printed and that nothing was found in blood just some ordinary prints. If a bloody palm print were found it would have been noted and would have been interest to both sides.