To overthrow the Teutonic state would have removed the pretext for Polish-Liithuanian alliance. If Lithuania, which wasbigger territorially than Poland at that time, had gone it alone, the Polish Comonwealth might have never come to pass. Who is right?
Lithuania was technologically two hundred years behind Poland and the Teutons and it had less than 1/10th population of Poland, there was a very real threat that Poles might end up being a new teutonic order for Lithuanians, the continued existence of the TO was required for the alliance not to turn on Lithuania.