What if Ante Pavelic and his clique of Croatian ultranationalists had not managed to gain the favor of Benito Mussolini to create an independent Axis entity comprising Croatia, Bosnia, parts of Dalmatia and Sirmium in the aftermath of Yugoslavia's breakup in 1941? Basically, resulting in other Axis and Axis-friendly powers taking over the NDH's OTL territory.
Would Horthy's Hungary desire to annex Croatia proper and Slavonia? What about Italy, could they devour even more of Dalmatia?
And the Serbs? A much weaker or nonexistent Croatia would likely mean a Serbian wank in the region, which could give Mihailovic's Chetniks more of an incentive to cooperate with the Axis. Any other ideas?