I am not talking about T, I was replying to your question in regard to the Isaaq. I was trying to explain that the split in haplogroups could have arisen as a result of a historical complete assimilation duiring the formative years of the clan. The Ciise and Samaroon also historically assimilated others into their clan system but unlike the Isaaq, they maintained their clan integrity by differentiating between those who are clan members by blood and those who were adopted into the clan. I do not expect you to have known this as you are not well versed in certain Somali clan lores. The adopted members form a small percentage of the respective clans possibly explaining why these clans do no display much haplogroup differentiation.
Capiche!
No capiche. In fact, I disagree strongly. That is not what either the DNA data or the good Haji had to say. The Dir and the Garhajis are virtually pure T. You can't assimilate other groups and still have that.