I honestly think he could have shown up in Prussia, especially with his mother there, and taken the throne with just local support, a lot more than the Stuarts had. Interesting question: whose side does Heinrich take in this scenario? (Of course, whether it matters depends on the date, because Heinrich was so much younger.)

Excellent question about Olympias, I wonder the same. She strikes me as more of a Catherine than not.

Haha, well, based on what Fritz had to say about Rousseau (Fritz's eyerolly letter is *hilarious*) and how he reacted to his father trying to get him to do anything he didn't want to do, I can't imagine Rousseau having much influence. But even if we assume a non-freethinking lightside FW who doesn't believe in philosophy and is still dragging his family to Pietist church, I just think the key was not to force anything down Fritz's throat.