Very interesting numbers.
If you take the total to be balloted,9,824 and the numbers quoted at the end of the letter 906, it is clear that BASSA's numbers are falling.
The 906 are clearly Amicus/CC89 as they do not use checkoff.
That means that BASSA have 8,918 members from a possible 13,000 cabin crew.
The list of reasons for dispute looks the same to me