If there is to be a reform of T&C's, it cannot happen in one go. Although the Single Fleet is still an ambition of the LT, for the moment the survival of the company is paramount. Unions are all about protecting jobs and T&C's, not destroying them. Let's see how good BALPA is when Walsh turns to you again as he surely will.
Why can't it be in one go? BASSA have had the opportunity to resolve issues over the past 10 years. It has steadfastly refused to do so hence you find yourselves in the position you are in now. Other groups have taken the 'bit at a time' approach, or the 'roll over and take' as you seem to like to put, hence we have less of a painful fall. Or, once again as you like to put it, a 'sweetheart' deal. Which of course it is nothing of the sort just the result of years of pragmatic decision making instead of dogmatic refusal.
Cause and effect my dear SP.