Hmm, this would imply that Magadle Maxamed Xanaftire is the paternal clan of Habar Garxajis, not the mother's clan after all.  This would make Samaroon and Habar Garxajis very close relatives indeed, within 30 generations.
Checking this hypothesis a Biyomaal and a Quranyow Garre should be tested if they also are very closely related to this lineage, as those are also Maxamed Xanaftire clans.
A few possibilities:
Isaaq is Isaaq Axmed "Magadle" Maxamed Xanaftire?  Habar Xabusheed is related maternally somehow.
Isaaq is the mothers clan of both Habar Magaadle and Habar Xabusheed?  Could be a Habar confederacy of uterine brothers from different fathers?
Confederacy founded by a religious leader?