1. Kistanes claim decent from Shewa nobility
2. Welene claim origin of Turkey/Iraq
3. Silte claim origin from the extinct Harla Somali
Plus:
Predatory policies of Ethiopia, often largely influenced and executed by bigger tribes like Oromo and Amara with the unsatiable quench for more lands and assimilation, it's an impossible task without a dictatorial armed political liberation front that could force union.
I am not a defeatist but realistic.