Excluding Turkey, which country do you think would come out of the war victorious? Assuming the possible participants are Greece, Serbia, Albania, Bulgaria, Romania, Croatia, Montenegro, Muslim Bosniaks and Slovenia.
Serbia, Montenegro, Romania and Greece will probably try to form an alliance against Croatia, Slovenia, Muslim Bosniaks, Albania and Bulgaria. My guess is the former is more likely to win against the latter since Greece's armies are much more superior compared to Bulgaria's soviet-era armies thanks to modernization of Greece's armies on German's marks. And the rest, Slovenia, Albania and Croatia cannot be considered serious contenders when pitted against Serbia, Romania and Greece.