Had a similar conversation with our AS consultant, he said about turtle diagrams not being a requirement but some auditors focus on them. We were starting to do them anyway so it wasn't an issue but it gave us an insight into how what people look for isn't always what you are required to do. I was recently audited by our largest customer and was able to comfortably ask him to show me where I had to do what he was asking as it wasn't in the standard, also where what I was doing was wrong for what we needed to do in our factory not what he has to do in his. He was quite happy with my response couldn't disagree and laughed about the fact he had been the one who had been advising me when I started the job and had obviously been too good at it.