Besides the recent lore released about Germany’s political parties, I wouldn’t trust the current lore for Germany because it’s likely to be heavily rewritten. August Wilhelm is likely different due to a German victory and the lack of Nazi’s. However I’m a bit befuddled and annoyed over why the Kaiser’s son of all people is King of Poland. Historically the royal houses of Saxony, Bavaria, Württemberg and Austria were all fighting over the Polish crown. All of them have a better claim to the throne than August Wilhelm and honestly seems like a decision made to cause chaos in Poland. Also he was the least favourite son, as you said, and a complete non-entity compared to his brothers who made a name for themselves in the military. So why did the Reichstag pick him of all people?