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Just an idea I was thinking to use in my TL: if Sigismund Vasa had died in 1587 after his landing at Danzig but before the battle of Byczyna (for example, if at the time of his arrival Danzig is being affected by a plague and he dies) how would it affect both Poland and Sweden? Would Archduke Maximilian be accepted as king? And in Sweden, assuming that John III and his wife still have a male son born around 1589 (IOTL he would be John, Duke of Östergötland ) would this three years old boy be accepted as king or the throne would go to Duke Charles ?