All clans, heck even all families, have a mixture of dark skinned and light skinned individuals.From my suugo science eyeballing, I have noticed that some clans have a higher number of dark-skinned people and if it's true that some clans have highter SSA, then, it does make sense.
Somalis are a homogenous group with no major clan being different genetically from the rest.
We aren't like oromo who assimilate people.
Somalis literally genocided nearly everyone on the peninsular whenever we took land we killed all the natives and colonised it with Somali which is why you can walk from zelia to Mogadishu and you won't find anyone who diverges from you that much.