I don't know why they assume just because rogue Lupi are involved, it must be the same group led da 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 lupo Games were simply just re-skinned Lupi 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 da now that just about every lupo character except for the originals are what they are- cheap re-skins. Princess is Claws, the lupo 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.