Amazing how fast alliances change.
Abiy sees Amhara ultra nationalists as more of a threat to his grip on power. TPLF just wants to rule Tigray because they know ruling from addis Ababa isn't likely to occur.
Then why didn't Abiy keep Amhara radicals at arms length just like his predecessor H Desalegn did? It's surely because Abiy is of the same mindset as the Abyssinianists and that they maybe only fight about which person should rule the country