Mareexan Rer Xassan and Gurre in Liben Zone were displaced from Negelle by the Boran and most Reer Xassans have crossed the border into Gedo; they now dominate Luuq town. The Gurres have also migrated in large numbers to their exclusive woredas in Guradamole and Goro Bekeksa in Afdher Zone. Gurres are actually a subclan of Akisho.
Marsin is right in highlighting that Mareexans also have deegans in Shilabo Woreda.
Negelle?? You can't be serious, you probably meant Filtu
Anyway, after Degodiye declared their alliance with the Borana they tried to expel the Reer Xasan from Filtu. What happened was that Reer Xasan moved from Filtu woreda into the land of the Degodiye (Reer Deka)
Now Deka Suftu woreda is majority Reer Xasan, a woreda that was named after a Degodiye subclan. They never moved back to Gedo, as a matter of fact Suufka is now the largest town in Liiban, even larger than Filtu. They allied with the pagan Borana in the hope that it would help them against Reer Xasan and Garre.

GS
Calm down, be objective and take the Darood lenses off. The biggest towns in Liben district are Mooyale and Doollo Ado.
The Reer Xassan have moved in large numbers to Gedo and displaced the other Mareexans from Luuq town. You think they magically appeared with the Gu Rains? Niggas trekked from the Ethiopian border. They lived as far as Negelle town before being displaced by the Borans from the K5/Oromo border areas. Furthermore, there is no Suftu Woreda, it is a small town. The only recognised woredas are Doollo Addo, Hudet, Filtu and Mooyale unless new ones have been announced since I last checked. The Liben Zone has a minority of Garrimari, Mareexans, Gurres, Ajuran, Karanles etc but credit gotta be given where it is due to the Garres and Degoodiya as this zone is their playing ground. The following link highlights what happened to Filtu before it was reduced in size after the Oromos went medieval on the Mareexan and Gurre pushing them towards Degoodiya territory.
Similarly, Liban/Filtu district is the home area of diverse Somali clans. The southern part of this socially mixed district adjoining Doollo district is an extension of Digodia territory, while the northern part starting from Xey Sufto village as far as Negelle town and its surroundings form the traditional territories of four Somali clans: Mareexaan (displaced since 1992), Gurre (dispossessed of its stocks), Ajuran and Karanle. Like their Oromo counterparts, these Somali clans consider Liban district as their land, and entertain the desire of it becoming a Somali administrative unit under Liban zone, whose zonal and district center would be Negelle town.
http://www.africa.upenn.edu/eue_web/libanzon.htm