Dividing the Cardassian holdings among the victors would probably depend on the geometry of the situation. If the worlds the Klingons had taken from Cardassia did not border on the actual Klingon Empire, but would be separated from it by a thick swath of UFP, would the Klingons still be interested? Or would they insist on swapping until they got the formerly contested Betreka region? If the Romulan Star Empire was completely isolated from any Cardassian holdings by UFP space (and by the Neutral Zone, the dispersal of which was never mentioned), would (and could) they lay any claims?
These evil empires of space might be too worried about the defensibility of far-flung assets to accept those, whereas the UFP would be happy to extend all sorts of indefensible tentacles towards worlds eager to ally with them. The end result here might be the UFP once again expanding while the other victors just take loot back home and stay within their former borders.