When you say to the detriment of mainline, do you mean a reduction of mainline aircraft?
Or do you mean a stationary LHR/LGW operation but an expanding mainline.
We've got to be careful not to get into nitty gritty of potential what if's.
As outlined before the reasons for a BA pilot to be part of it are quite clear, we would also like the OS guys to have the unfettered right (as per the seniority system) to move to different bases and different payscales if they so please.
It's better to work together than against eachother, it's the wet dream of any company.