Both Abiy And Isaias are facing emergency survival clear & present danger but Abiy is trying to save Isaias only!
There is no guarantee that OLA and TDF will not be coming to enter Addis Ababa and remove Abiy from power. However, ጅላፎው Abiy is sending his force to Eritrea to save Isaias. The 101 rule when you face an emergency condition is 1st save yourself , before you try to save others.