Butler,
You can repeat that it's "Bill's Offer" as long as you want. He was merely the head of department authorised to make that offer. He made it under the wider authority granted him by the airline and, as such, the offer is granted by them and not him. Also as such, the offer will not expire with his departure as has been noted above. That you choose to believe the BASSA mantra of "say it often enough and it will be true" speaks volumes for the amount of actual facts you have at hand, as opposed to the cliched suppositions that you endeavour to pass off as truths.
No doubt the offer will be reviewed and changed as time wears on. All offers and all contracts do. That's why the cry from some quarters for financial guarantees for life are so risible. They don't exist (as far as I am aware) in any company in the UK, and before the issue of US style contracts is brought up again - we work to a different legal system, like it or not.
Bear in mind that many of those who left Unite felt alone and unrepresented so your attempt to instil a seed of doubt or fear likely holds no water.
Why is it so few people from the pro-IA side of the camp are capable of presenting a rational and fact-based argument? It's almost invariably a rehash of the same rhetoric.
MrB