Papillon. Nicely summed up.
As cabin crew, I hope BA will, if they accept a deal, tell BASSA;
"Well, ok, we think it's a worse deal for your members, but if you think you can get them to vote YES to accepting it go ahead, BUT IT THEY REJECT IT, YOU ACCEPT OUR ORIGINAL PROPOSALS."
Mind you, BASSA will probably be able to spin it so that ot DOES sound like a good deal, though HOW I cannot imagine.
Frankly I'm furious.