First Balkan War
If you have read Edward Ericksson's excellent "Defeat in Detail" you can see why the Ottoman army was defeated. The war had five different theaters, of which three are covered by my and Chris's BBB scenarios. But you will notice how the Greek and Serbian theater are connected geo-graphically. The lack o adequate cooperation between the allies, partly due to competing strategic goals, meant that this geographic contiguity was not used to its full advantage, something that extended the war in the Western Balkans to 1913.
Second Balkan War
What stands out here is the very local character of the most intense fighting (covered by our BBB scenarios). Most of the battles took place along the corridor created by the Vardar/Axios and Strumintza/Strymonas rivers. The Greek and Serbia war-effort were geographically connected. But while there was more cooperation than in 1912, it still was inadequate. It defeated the Bulgarian attacks, but it meant that then the Bulgarians were able to check in detail the Serbs and Greeks.