The Sayyid wasn't a Somaliweyn that'd just a propaganda spread by the kacaan regime he was an islamist who wanted to spread his religious views or new Sufi order to the Somali people and ironically it was the somalis who ended the darawiish movement cuz of his brutal way of ruling.He wanted to bring SOMALI Muslims together. If this was about just muslims he would have tried to include afars, hararis, eastern oromos etc.
Read any book about Somali history and you will know somaliweyn was envisioned by the SYL with the inspiration from the Sayyid
SYL or SYC as it was known during the British occupation of Southern Somalia was set up by the British who supported a united Somali stated in the horn of Africa but that idea was put down by the Americans and the Soviets who were suspicious of British motives in the region.