There have very much been suspicions but I dont think there is any firm evidence to back up what you have said. There will have been incentives and deals but I suspect these will have been at a local BAA level and all will be up for grabs again with the sell off.
You will get a blinkered opinion however as those who adamantly support their precious EDI, as you will have noticed here and elsewhere, will not let anything lie
. And as for Emirates.... that looks like the biggest of the sour grapes.