Understanding cushitic history is useful to understand Somali history. Somalis , Oromo ,Afar and even Habeshas (language shifted Cushites) descend from the same ancient group and we are all "cousins". Other than this though cushitic is mostly a language category, there's south Ethiopian like konso who don't look much like somalis but still speak a cushitic language. Cushitic is just like Celtic a very ancient connection that is only useful to understand history, but it's quite ridiculous to base politics and nationalism on this. I'd rather base our relationship with our neighbors on possible common interests, shared history and economic integration.