Lusitania
Donor
I could see a joint Portuguese/ Ethiopian assault on Egypt by 1600. Not earlier. The Ethiopians needs to secure their base and expand into southern Sudan and along the coast. The Portuguese need to capture Aden with Ethiopian help. The Portuguese need to be secure from Spanish threat and have Morocco secure with that I mean control of coast and vassal interior nations. Then and only then can a more powerful Portugal launch an attack against Egypt with Ethiopian forces. The Portuguese would control the Arabian & Red Sea but an attack from Mediterranean would be harder if Ottoman Empire intervenes with their navy. Unfortunately we cannot count of Genoa or Venice to side with us since our control of Egypt would result in Egypt being under Portuguese influence.