After the amount of work they've sunk into levelling the guild, I wouldn't agree with this. Tell Z to put up or shut up - he can either be a member of the guild the way it is or he can leave.

Personally I'd kick him (along with any other alts you're not sure about). Deceit and manipulation do not make for a happy guild, and he has both in spades.

I don't know if this is the way. While it doesn't sound like this is a large guild we are talking about, some of the members might be left behind and some others might just want to start fresh on a new guild considering that's what they are being asked anyway.

I think this is a great idea. You can name your guild what you want, you won't have the stigma of being ditched by X the first time around, and everything you earn will be yours. Sure, you'll miss out on achievement progress and any perks you had in the old guild, but I think a fresh start for everyone would be best. You can also organize nights to do old achievements in case people don't always feel like dungeoning or raiding. It'll be a fun way to strengthen guild ties.

Does guild transfer allow you to switch names and not faction or realm transfer but still make that new guild? Tell everyone that the new guild name is "W" have anyone that wants to stay with B and the OP go to it. X can have his guild back.

At level 1.

If he wants to make it better, he has the opportunity. Otherwise, well, it will wither and die soon enough. Now everyone is happy. B and Op can make the guild they want, X can be GM of the old guild. X may be mad about the loss of all the perqs, but that is too bad, put up or shut up.