low South Asian without West African = usually a Zeila merchant influenced Somalilander
high South Asian with minor West African = always a Benadiri
New technique to tell where a person is from.
You see there is this tribe in Sanaag known as Ugayslabe. They are a mixture of Somalis and Indian merchants that used to live under the Warsangali Sultanate. That's why you'll see Warsangali DNA is quite different from the rest of Hartis. They are also intermarrying with eastern Habar Yoonis and Habar Jeclo in Sanaag.
As for Benadiri. They are a confused group but they have genetically been proven to be 50% Somali and the rest being Arab, Persian, Indian, and Spanish/Portuguese.
Benadiri people are a descendant of refugees and merchant opportunist that wanted to seek a better life during the Ajuran period in the medieval times where they settled in Mogadishu and mixed with the local native Somalis which gave birth to the Benadiris.
"The late 15th and 17th centuries saw the arrival of Muslim families from Arabia, Persia, India and Spain to the Ajuran Sultanate, the majority of whom settled in the coastal provinces. Some migrated because of the instability in their respective regions, as was the case with the Hadhrami families from the Yemen and the Muslims from Spain fleeing the Inquisition. Others came to conduct business or for religious purposes. Due to their strong tradition in religious learning, the new Muslim communities also enjoyed high status among the Somali ruling elite and commoners. It's believed the Benadiri people are the decedents of these people a tiny minority who inhabit the Benadir region."
Source: Luling, Virginia (2002) page 2 and 17.
As for Zeila. People today in Zeila are purely T1a, they aren't mixed. However, historically Zeila was a metropolitan city during the Adal period where the majority was Somalis but you had foreigners living among them and most of the Anjabis believe it or not were mostly Afar and Hararis since they shared a kingdom with us northern Somalis. You also had a small number of Arabs and Persians but Indians sound new to me. Anyways, when the kingdom collapsed the city was left in ruins and the so-called Anjabis that lived in Zeila mostly fled back to their homeland. I doubt Zeila and Awdal, in general, were affected by that much mixing.
According to Briggs Phillip sources. Indian merchants never settled in Zeila.
"Through extensive trade with Abyssinia and Arabia, Adal attained its height of prosperity during the 14th century. It sold incense, myrrh, slaves, gold, silver and camels, among many other commodities. Zeila had by then started to grow into a huge multicultural metropolis, with Somalis (Predominantly), Afar, Harari, and even Arabs and Persian inhabitants."
Source: Briggs, Phillip (2012). page 53.