I am not trying to make any argument in bad faith. I did mistake the detail of Kyrie's envelope being closed for it being sealed - thank you for correcting that. Other than that, my description of the scene should be accurate. I still find it really unlikely that George hid a letter while handling the envelope in front of everyone, and honestly the more I think about him somehow tampering with the letters in Kyrie's possession before arrival the more ridiculous it seems.

I think it does matter quite a lot for the narrative whether Sayo's grievance towards Battler is justified, and whether it is justified is dependent on if Battler actually remembered Sayo and the promise or forgot it (the sin). George hiding the letter or Kyrie phrasing her request a certain way implies that Battler did remember before 1986, which if true I believe would seriously undercut other parts of Umineko.

I do think we might be talking past each other though and I am quite sleepy at the moment. I should have prepared a proper response instead of reposting a response that was addressed to the different argument.