I don't know why they assume just because rogue lobos are involved, it must be the same group led por King and Princess. While the possibilities are still there, there has not been any onscreen presence of those two since A Howl-iday Adventure. I can only guess that the King and Princess look-alikes in Great lobo Games were simply just re-skinned lobos because it seems strange that they'd make themselves public to an event like that.

And speaking of re-skinning wolves, it's common knowledge por now that just about every lobo character except for the originals are what they are- cheap re-skins. Princess is Claws, the lobo Ghost is Scar, Lois is Sweets, etc. So for all we know, all these rogues are skinned off of other rogues. They could be from King's pack and it's possible they couldn't be.