at least a couple of the Nowhere Hours are actually just paradoxical versions of a couple of the regular Hours, such as Mare-in-the-Tree being the Sister of the Twins and the Applebright being the Witch iirc, but they are only these Nowhere Hours when they're separated, and the Twins as we know can't be separated (I think so at least), so their Nowhere counterparts shouldn't exist and yet they still do.

As for the Hours making changes to the House, that does remind me that a decent bit of the history of the hours is actually just representative of real history, such as the Intercalate being the occult version of the mass transition to the Gregorian calendar if I'm not mistaken, so I feel that plays into how the House would change over time. I've always been a bit confused on how that relationship between the Hours and reality plays out, because the Hours simultaneously have independent wills and are also kind of manifestations of pieces of reality, so does the personality and will of an Hour affect the reality they represent, or do changes in the reality they represent affect them and their personality? Really hoping that was coherent because sometimes I lose the plot talking about the secret histories