They got almost all the HOA lineages, they aren't paternally bottlenecked like Sahos and Somalia-Somalis.
Then this could be sign of a recent ancestor, likely within the past 250 years. The Degodiye have had extensive contact with the Boran for a long time, and were tiiriso (clients) of the Boran. I would not be surprised if the subclade is one found among the Oromo than a truly south cushitic variant.
@NFD what is the Ethiopian ancestry percentage for your sibling?