"In addition to attempting to solidify the intra-Mohamed Zubeyr alliance, Ogaden leaders plan to discuss ways to bring smaller subclans and minority clans in Lower Juba into the now predominately Darod/Kabalah alliance. Ogaden leaders told us they think they can appeal to non Ogaden/Absame subclans in Lower Juba, such as the Galjacel, Biyo Mal (Bantu), Shekal, and Awaro Mali, by offering to train their militia. In addition, Darod/Kabalah leaders are reportedly negotiating with the Darod/Marehan in Kismayo, a relatively small group that formed a tactical alliance with al-Shabaab because they did not want to lose access to Kismayo port revenues (reftel).
http://www.cablegatesearch.net/cable.ph ... AIROBI2457
The cable mentions GaalJecel and Cawramaleh as normal clans, but when it comes to Marehan, relatively small group


As for population, Gedo is known to be the most deserted regions in Somalia; more like Barri where there the cities are barely populated. I wouldn't be surprised if the entire Gedo has a population around 150,000 the most. Baardheere is the biggest and it has around 80,000.