Nope Reer xamars aren't a clan confederation, there are reer xamar clan confederacies/alliances such as Reer Maanyo, Moorsho, Iskaashato, Dhabarweyne, Bandhawow, Indhoweyne, Qalmashuwe, Saddex Geedi.
Gibil Madows that hail from clans in interior are not majority amongst all Reer xamar gibil madows let alone all Reer xamars.
Moorsho firstly isn't a clan or lineage, they're a multi ethnic confederacy and it's the name of an area .
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Currently Moorsho consists of:
1-Reer Maxamud Eebow
2-ReerBaatay Eebow
3-Reer Ibrahim Eebow
4-Reer Khalafow
5-Reer Mahadow Amiin
6- Reer Aweys Nuurow
7-Ba Xamish
8- Xaatimi
The Ajuran within moorsho such as the 4 Reer Eebow and Mahadow Amiin claim to be from Abdalla Dayle . Xamar clearly existed centuries before that , the earliest known existing tribes are Reer Faqi, Shaanshi and Guudmana. The fact that they claim origin from subclans of larger clans in interior hints to how recent they arrived
Khalafow isn't a clan , they claim to be from Silcis, there isn't a subclan , sub sub-clan or even sub sub sub clan of silcis named khalafow. Since Silcis initially resided in Lama Jiidle area and ended up losing their dominion there in 18th century, it only makes sense that a group of them ended up fleeing to Xamar where they settled.
Xamar is older than Samaale let alone Murusade so a gate being named after them in past few centuries doesn't prove anything.
You've obviously only seen the few manuscripts available online, as I mentioned above , the copies of the manuscript which were given to cerulli were copied from earlier manuscripts. Even if the latest copy is from 19th century, the topics are not from that century and the content was merely passed down through copying.
Our evidences suffice us if there are external sources that are found backing it up further then that works in our favour, if not then it still remains valid.
Himyari's finding settlements in banaadir coast occured before Islam , you've got no sources proving Samaale's residing there during the time of Periplus Of The Erythrean Sea.
It's clear that your hoteping is fueled by emotions and envy, zero facts or logic used.