The very nature of this is that it is a 'rumour network', and therefore you have to take everything here with some degree of scepticism. However, I am inclined to think there may be something in this. The bottom line is that the BACC cannot arbitrarily anounce to GB, BMed or anyone else how things will be. I am sure the folks at BA will have noticed that they are in dire straits and a job with BA is not what it once was.
Any rationalisation of the BA SH operation which inolves GB taking over the running of things is not a case of BA absorbing GB. Therefore GB pilots will not be 'just grateful to have a job' and giving a big thanks to BA for their kind interest in the copmany. There is no way that GB pilots will sit back and let their CC negotiate some naff deal whereby the FOs are shoved to the bottom of a seniority list somewhere. Should some deal be reached with BA, there will be a lot of water to flow under the bridge regarding terms and conditions. Nothing has been agreed among the pilots yet, and therefore the assumptions being made regarding future deals are at best premature.