Alain, welcome to the site.
As a matter of curiosity, you are an ex believer but all of your questions are in connection with the "scriptural" evidence for doctrine. Would you like to say why this exercises you so when you have already personally passed the stage for being concerned. I wonder if you are in discussion with family of friends who are JWs and trying to show them where they are wrong?
As an important side note, since the ambiguities of events, accounts and teachings in the Bible are so profound and the consequences of which are divisive sectarian beliefs, doesn't this tell the researcher that doctrinaire interpretations of the Bible are all hopelessly flawed?