So he missed fresh gouges and scratches extending from her hand up to her elbow but noticed and noted old scars? He also detailed injuries on Nevil of a similar type to those that Roch is claiming were present on Sheila so how could he possibly miss similar marks on Sheila? He was Peter Venesis not Mr Magoo, so good luck with that theory!
it has happend before thres a vase of patholgist who said a man had been kicked to death when he had in fact been shot he dident notice the bullet
now if a mistake like that can be made then surely eochs sugestion is not completly unfeasable.