It doesn't work when you have positions that you are trying to maintain. It does if you have nothing but a blank sheet.
I am sorry to say but Unite/BASSA long ago gave up the right to start negotiations afresh with a clean sheet of paper. WW does not need to negotiate afresh, Unite/BASSA are almost beaten and the end is near.
WW gave them every chance and if he does anything but damage the union to the point it can no longer be the negative, unpleasant disruptive influence which I and many others have had to suffer for years then we will suffer the same again in a few years time.
The collateral damage suffered by the good people is an unfortunate fact of life in any serious fight. This fight will be won by WW. Unite/BASSA will be a spent force and a good few militants will no longer be employed by BA.
BA will be a happier and better company after the whole painful episode is over.