The idea is simple: How would the Entente fare with Bulgaria fighting alongside it? I imagine the war would've ended sooner given they would've been in a prime position to not only invade the Ottoman capital and help support Serbia against Austria but also allow for transient of Russian shipping and supplies to arrive towards the Russians.
The Pod here is that there's no Second Balkan War with Bulgaria fighting all it's neighbors, not only that but Russia manages to convinces Serbia to go for Yugoslavia by dismembering the Slavic parts of the Austro-Hungarian empire instead of having territorial ambitious south as well as Greece getting support for it's Megali idea of annexing the coastal area of Anatolia with Greeks in it.
Of course there would be post WW1 tensions over fighting for territory, again, but that's for another thread.
The Pod here is that there's no Second Balkan War with Bulgaria fighting all it's neighbors, not only that but Russia manages to convinces Serbia to go for Yugoslavia by dismembering the Slavic parts of the Austro-Hungarian empire instead of having territorial ambitious south as well as Greece getting support for it's Megali idea of annexing the coastal area of Anatolia with Greeks in it.
Of course there would be post WW1 tensions over fighting for territory, again, but that's for another thread.