Re: IF sisko accepted weyouns offer in "to the death"
Weyoun would have suggested anything he thought might persuade Sisko. It doesn't mean he had any intention of honoring the offer.
The Dominion usually kept their promises, at least the letter of them. Weyoun made the same offer to Dukat, remember, and followed through. That is not to say Cardassia (or Dukat) were better off for it, though.
"In the name of the best within you, do not sacrifice this world to those who are its worst."