Steve,
I think I see your POV. I understand Kyrill's points too, and I don't actually feel that all your business associations need be aired here. Perhaps some, but not all, but I do not make or enforce the rules. That is properly the prerogative of John, and he's done a pretty fair job so far.
However, you must know you are escalating an issue here and that losing face is now pivotal. John has asked you to do something you are reluctant to do; I have tried to make peace; you have become more strident; John is being backed into a corner; the inevitable outcome is that very soon you will leave the forum, both of you firmly holding to your ground. I can speak for neither of you, and my position is rapidly becoming untenable, but it happened on my watch and I'm very disappointed because I like both of you.
Unless you can patch this up privately, out of sight of the membership, and capitulate somewhat to John, and simply ask him what he wants and show signs of compromise, essential in conflict resolution, then I don't see much hope. It is now up to you to make this approach.
I would be disappointed, intensely so since you are a decent fellow and a great repository of transformer knowledge, but so be it.
Psychology is the single greatest determinant in human progress.....
Cheers,
Hugh