Somalis lie about their identity. They claim Arab. How can we believe them about Oromo and Bantus not living in the south and central regions when they have a history of lying and when the proof is in the pudding?
Bantu themselves will tell ya, or used to tell ya, they are not native.
"he Somali Bantus are the minority ethnic group found in the river banks of Somalia, a country mostly inhabited by Somalis. The Somali Bantus lived in Southern Somalia near the major rivers recognized as Shebelle and Jubba.The Somali Bantus are the descendants of many Bantu ethnic groups found in East part of Africa like Tanzania, Mozambique and Malawi.
They were brought to Somalia in the 19th century as slaves by Arabs. Most Somali Bantus who were brought as slaves in 19th centuries were from the tribe of Majindo, Makua, Manyasa, Yao, Zalama, and Zigua. More importantly, the Somali Bantus are culturally, physically, and ethnically different from the Somalis. "
http://www.sbcmala.org/our-history.html