"I'm sure Emirates will have had a number of reasons for choosing GLA and NCL rather than EDI and I wouldn't like to claim that the PCNs at EDI are the only reason but they would appear to be quite an important one. The others will include the shortage of large stands, poor international arrivals facilities and many other factors connected with the infrastructure. I don't to have access to Emirates' market research so there may be other reasons."
Have these 'PCN's' or lack thereoff been confirmed or denied by official BAA sources? Are you just guessing?
I look at NCL and what I see are facilities deficient to what Edinburgh has, maybe Emirates did their homework and never ever Intended to serve Edinburgh, maybe their preferred option all these years has always been Glasgow, nothing sinister.