PC: Ostrogoth State in the Balkan and Pannonian Region

SO there were two Ostrogothic leaders who have a sense of rivalry with each other? That doesn't sound like a successful venture for the Ostrogoths. Though I am a bit skeptical as to think that Theodoric had a chance of conquering Constantinople or installing a puppet Eastern Roman Emperor that would be a virtual vassal of Theodoric's Ostrogoths. However, this is before Justinian's complete reconstruction of Constantinople to include those infamous walls. Perhaps if Attila had sacked Constantinople before they could finish their repairs of the city walls, that might be enough to damage the Eastern Roman Empire, though if the Ostrogoths were under Hunnic control by the time Attila dies, they could provide the spark that would regain their independence from their Hunnic overlords.

Let us not forget that Zeno also lived in the same era when Attila was raiding the Eastern Roman Empire, and a simple error on his part would have butterflied his attempts at conquering the Western Roman Empire.

Yeah, and there were also Roman court politics to consider as well. It wouldn't be far fetched if Zeno and his successors had been given the Romulus Augustulus treatment. Moreover, the Ostrogoths would in this case be responsible for the collapse of both Roman Empires. I'm not sure when the Lombards had started to appear, but they might be assimilated into the larger Goth population in the Balkans.

I'm also unsure of what the relations between the Ostrogoths and their Visigoth cousins were like, but given the distance, it might not be that warm. One thing also to consider is that the collapse of both Roman Empires will actually give the Vandals a chance to survive. In this case, you may have a surviving Arian Christian state in North Africa, or both the two Gothic factions (Ostrogoths and Visigoths) and the Vandals would become the leaders of Arian Christendom. You might also have the Vandals expand into Egypt in this case, or the Ostrogoths would simply absorb the territories of the former Eastern Roman Empire while either the Visigoths or the Franks would absorb the territories of the former Western Roman Empire. Or alternatively, the Vandals conquer Visigothic Hispania.

The example of the Crimean Goths would be an indication of a blend between Hellenic and Gothic cultures, so in the case of the Ostrogoths, they would almost assimilate, but they get to keep some of their more prominent Gothic traditions and customs. It would be similar to the Slavic invasions and the subsequent rise of nations like Serbia and Bulgaria where Greek culture has been transmitted into their Slavic customs, as would Kievan Rus to a lesser extent. However, the Sassanians would have overstretched themselves if they tried to take Anatolia and directly incorporated it into their empire. However, you might get a larger expansion of an Armenian satellite state if the Eastern Roman Empire collapses a bit (OTL Byzantine Armenia would be attached to Sassanian Armenia). There might also be an attempt to revive the Palmyrene Empire by the Sassanians, but Egypt would definitely try to reassert itself as an independent, Coptic state in this case.

The Vandals wouldn't have a chance to stage a huge raid into Egypt, but they would consolidate their gains in North Africa around Carthage. This is the era where Gaiseric and Huneric were ruling the Vandal Kingdom, so they could also take part in the hijinks that would place the nails on the coffin of the Western Roman Empire. Hispania would be retaken if Gaiseric desired, though sooner or later the Vandals would face off against the Visigoths and Ostrogoths should both Roman Empires fall apart. Moreover, the Vandal adherence to Arianism was so strong that religious intolerance was the major factor of the Vandal state.

One other thing too: it would be interesting to see how the Ostrogoths would handle the Avar incursions into Europe as well. Though I'm not sure what the Gothic fighting ability is like, the Avars were mostly light cavalry based. Despite the protection that they may get from the Carpathian mountains, the Avars would just go through what would become Wallachia and Moldavia due to it being flat land. Another thing too is that during this time period, the Avars were allied with the Lombards against the Gepids, so in an Ostrogoth Balkan scenario, the Gepids would actually become allies of the Ostrogoths. Alternatively, the Avars may also opt to invade the Sassanian Empire instead since there is no Eastern Roman Empire to contend with (alternatively, the Eastern Roman Empire might fracture into several successor states, resembling OTL China's Warlord period).