Still, havin' just a little to go on would help those that have virtually nothin' to work with but that's askin' too much.

A pattern? Not really. Seems like they come and go at random and this includes the numbers in each house. Don't think there's anything set on that, mate. Switchin' houses would prove difficult since it seems like the go by personality and not by primary ability. Guess they wanna keep things random and chaotic.