There may be remnants of the Waaq religion still being practiced in Somalia, but no reason whatsoever to believe that Somali Sufis borrowed from the Gadas or were "behind" the rest of the Muslim world in their practices or in what they taught. The principle Somali Sufi saint, principal of the Banadir Ulama, Aweys al Baraawe, received a world-class education in Baghdad, the Yemen and Hijaz, and was influential in missionary work in the interior of Somalia and at least as far south as Tanzania.
I do not doubt that certain Waqqist rites have never been expunged from the Somali culture, but dhikr and siyyarro were Islamic additions that were never among them. Read the history. It's the Wahaabbis and their obsession with destroying and revising history that is the abberration.
In general:
http://www.angelfire.com/az/rescon/SUFIMYSTIC.HTML
The leading Somali Sufi:
http://ashaacira.wordpress.com/taariikh ... th-afrika/
See "The Banadir Ulama" in:
http://books.google.com/books?id=XpdAzR ... q=&f=false
