Diplome,
Rationally you are correct that BASSA should be looking after the best interest of all their members but that has not been the case for over a year now. What seems to be the driving motivation of this union is to maintain the power they have OVER their member's lives by maintaining their grip on the operational structure of BA IFCE.
Unfortunately since that lies at the heart of the dispute, I don't see any resolution is ever possible. You are completely correct that they are balloting over issues that should and could be litigated - except of course they would probably suffer the same defeats of previous court appearances.
Even a failed ballot won't resolve the issue because the union has vowed to wage guerilla war on the company.
TB