Abiy has made it clear who was behind this coup, his words as followed "Groups who advocate old ideas from 40 years ago"
This coup attempt was orchestrated by radical Amhara terrorists, primarily from the group known as Ginbot 7 and other Derg loyalists who yearn for the dismantling of the current ethnic federal system. A centralized Ethiopia ensures there survival as they are swarmed by enemies on every side, they have no allies and internally there are divisions, the Agew tribe within the Amhara region want to seperate and create their own maamul.
The chief of staff killed was neutral and not supportive of their extreme ideals which was why he was killed, the regional president was a target for being too close to the Oromo administration. They are not only Anti Tigray but Anti Oromo as well. How they can take on both regions remains to be seen.
I welcome the prospects of war in Ethiopia