Clearly you are clueless about the current Ethiopian politics. No single Ethiopian believes TPLF is using Abiy Ahmed, not even TPLF

If you think so then you are out of your mind and are absolutely not in sync with the current Ethiopian politics. Abiy has removed all top TPLF generals and security officials and now controls all the intelligence, security and military apparatus fully. Why does he need TPLF? It is insane to think TPLF uses Abiy. Abiy even kicked TPLF out of the leading EPRDF coalition and created a new party with all former EPRDF members except TPLF. He has jailed many TPLF officials and generals, removed all TPLF ministers from their post. Currently there not one single TPLF minister in the federal government. TPLF currently has zero say in the federal government. You need to sync with the reality.
Abiy is not about the domination of one ethnic group though. He is ethiopianists through and through. He seems to despise tribalism. He is not working for one ethnic group but for his own legacy. He has a big vision for Ethiopia and he wants to be remembered as one of the major leaders/kings of Ethiopia. He ain't your usual tuulo boy

Because of this, he has a wide and very diverse support base from all ethnic groups including among tigreans.