Majerteen didn't evolve out of a cheifdomship btw. It was part of a larger non-clanal sultanate which ecompassed all of hartis and that sultanate was a tributary vasal to Awdal but it fragmented in the early 1600s which is when it re-organized.
Geledi as well, which was one of the vassals and other surviving cities like Luuq much like Harar as well was connected to larger polity , they didn't evolve out of chieftainships.
Cheifdomships and single city states and seperate states were due to a collapse in the 1600-1700s that fragmented the region.
Hiraab did rule over Xamar, but Xamar was more or less a city state with a council under a titular leadership in the 1800s. It wasn't a wide teritory and/or a collection of towns under one leadership like Majerteen/Hobyo etc
and Ajuuran was a local nickname for taxing and administrating authorities, not much different to what Majerteen referred to their own urban admins as Saladiin's. Are we going to refer to a Saladiin sultanate and saladiin empire?
You can't fault Somalis for faulty research and representation by foreign orientalist writers.
And a big large sultanate that extended over the southern coast and into the interior reaching Hadiyah and with its commercial capital Mogadishu, was decribed by foreign visitors , in quite detail. But just like Awdal it wasn't a clan empire