Aldarion
Neoreactionary Monarchist
It definitely is a possibility, seeing how a war did ensure between Ferdinand I and John Zapolya following the Battle of Mohacs. And Croatian nobility was somewhat close to Habsburgs, so yes, we might end up breaking off.Could a three way struggle ensue in the Władysław-Jan Olbracht-Maksymilian triangle, each supported by a different group of magnates and nobles?
Could Croatia end up breaking off under Max, while the brothers - or rather, the factions wishing to put them on the throne - fight it out in '91 and '92, i.e. up to the Polish election?
As Kazimierz died in June, before the news reach Hungary and Prague the campaign season should be in full swing before the news reach the brothers.
Not sure campaign season matters - in fact, Hungarian armies tended to campaign whole year long, but particularly throughout the winter, counting to avoid field battles against Ottoman forces by doing so.