KW has a very difficult balancing act. A deal is needed to bring closure so the business can move on, and he'll have to give something to BASSA for a deal to be palatable and so they don't lose too much face.
However, taking the temperature of non-CC BA staff there is a very strong sentiment that whilst BASSA has lost in terms of not securing a reversal of the crewing changes and the dissolution of Mixed Fleet, BASSA's behaviour has been so abhorrent it must also be seen to have lost and should be given any concessions which it can use to claim victory. Put another way, BASSA has to learn that throwing hissy fits doesn't get you anywhere.