My point was they aren't a coehsive clan with common founder like they claim to be, sure the shegaad lineages may be smaller in number, the point remains they are a confederation just like the Isaaq, Hawiye etc. Just because it is codifed in Xeer doesn't change the facts.
That is where you are wrong, they are not a confederation, genetically speaking or Xeer wise. They differentiate between those who are Ciise By Blood (Dhalad) and those who are Ciise by Xeer. What really matters is if those that are clearly identified as Ciise are not Ciise genetically; now then they would be a confederation.
As for Hawiye, how are they a confederation? If you are referring to the identification of non-Hawiye clans as Hawiye then you got it wrong. The non-Hawiye Samaale clans such as the Xawaadle (Meyle Samaale) and Gaaljecel (Saransoor Gardheere Samaale) are not part of the Hawiye clan structure but are classified as Hawiye in the 4.5 system etc because it is mutually beneficial to the Hawiye and associate Samaale clans. The Hawiye boost their numbers/influence whilst the other Samaale clans acquire more influence than they would as stand-alone clans.