I have already answered your question about what colours you might get if you mated your bitch to an orange/white etc - there is no way of knowing in advance since although she has recessive genes back in her pedigree, it does not mean she carries them herself. It's nothing to do with being clever or not clever - that's just how it is in Cockers
Now if your bitch's mother was orange, then you'd know she carried the orange gene but you can't know when the colour is further back in the pedigree.
As for the comment about an Optigen tested A dog producing an afflicted, this was told to me a while ago and when I asked that person which dog and what the evidence was, they couldn't provide it
It's one of those "myths" which is being circulated by those who don't want to test or who have tested and don't like the results they've got (this myth also seems to be particularly prevalent in the West Country for some reason). If people want to believe something, they will whether the evidence is there or not