I can understand the part about the Freebooterz being these sterile outcasts of the Orkoid ecology, but the Clanz? If we take the anthropological paradigm of Cultural Ecology we will see that culture is a reasonable reaction to the environment, or at least that there is a very clear relationship between environment and culture. With this I mean that cultural customs are not random and illogical but are rather the opposite. Take for example the holy cow in India, the logical explanation is that the cow could be used for so much more than just its meat.
Perhaps the Ork Clanz are also cultural expressions which came about when the Orks moved to different environments, meaning that the Clanz are coping strategies of a sorts. Blood Axes came about when Orks came in contact with other species and were in environments in which the proportions between the Orks and other aliens was that the Orks weren't in a greater (or desired greater) majority. Snakebitez would pop up once there aren't enough (fuel) resources in some area (explains the extra high number of grots, snotz and other inferior orkoids). etc etc etc.
That definitely has potential and fits in with one of the other environmental / genetic possibilites I was considering...the emergence of weird boyz, smart boyz, etc. Perhaps their are environental conditions or conditions within the mob, that cause these specialized Orks to emerge....like changes in sex among fish and some speceis of amphibians in response to environmental conditions. Possibly, the various clans could be genetic castes within ork society. When the brain boyz existed, they could modify orkoids into these different castes as needed. Environmental conditions could trigger the changes that the brain boyz previously brought about by a conscious act of "hybridizing" or specializing the standard orkoid.
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