The ban on upgrading vampires or butterflies is a clear ban that is interpreted by a clear rule, but in the case of the Barbarian, it's some kind of stupid, artificial, and illogical addition to the rules, which creates controversial situations (as in the case of red rush, by the way). Why are they needed in tournaments?

Added 5 minutes later
Come up with a normal interpretation of the rules that won't make me get bombarded with questions like "is it allowed or not?" or "why is it like that?", and then I'll agree. I suggest something simple and clear: whatever scroll, that's the guild. And no matter what you do, whether you create a template or build a castle.