There was no Adwa victory with out Tigray & same was true with out Ethiopia!Fact!
Imagine if Tigray sided with Italy in the battle of Adwa, there would not be victory for Ethiopia. Imagine also if Tigray was alone fighting against Italy , lonely Tigray could have been defeated! Hence, Tigray has to ally with the Federal government of Ethiopia no matter it is not happy due to the genocide Abiy( with Isaias) committed on Tigray.