Look up the page at the BA thread and you will realise Balpa had no real part in this decision. Let's be real, I'm sure the CC etc were TOLD what was happening, but they don't have any power.
TUI had no choice, fail to act and J2 would have snapped up those 100 pilots and be breathing even deeper down their collars than they already are, particularly at MAN. J2 will have their own challenges at merging the TCX guys trust me. The good news is these TCX guys have got jobs where they want to be based, the 'bad' news is that seniority has again been exposed for what it is, a sham, at least in the UK anyway.