Because I do not find it credible that the GM will organize a rebel group and have a rebellion against himself.
I find it more credible that a second GM might, especially if each GM was assigned different objectives.
Except that I can almost 100% guarantee that nothing of the sort would happen. GM realms are not implemented just so they can be just another realm, but with Super Soldiers for troops.
Players expect consistency because we know it is one GM. We don't expect that kind of consistency from human realms.
Yeah, I think we've already proved that's simply not true. Exhibit A: Vates. Case closed.
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