They could have tried to disintegrate Ethiopia. Infact may have tried. But apparently a stable southern neighbor for shabiya was more advantageous for them than a fragmented neighbor. To disintegrate Ethiopia it was not in the interest of both rebel groups. The plan was to exploit the spoil. Also disntegrating Ethiopia was not on the table to consider it with their foreign handlers because that would create unstable HoA for the big guys. Shabiya could have tried to sabotage or try disintegration but would not be its best choice after the grueling gurella war. Once they got their wish or primary goal that was it. The next plan was how to run TPLF and exploit Ethiopia, at which time hell got loose between two Tigrigna speakers. Ethiopia survived by miracle and perhaps due to TPLF and EPLF global handlers. These two evils did not do any favor for Ethiopia as a country. The country is still in trouble bs of what Shabiya and TPLF invested but chickens come home to roost-TPLF and Shabiy to some extent tasted what they clocked !
No credit for them why Ethiopia survived!