If Sean had some super secret longing to get to the throne, he kept it well hidden. I don't recall Meisner ever bringing it up and he was the closest to Renard of anyone. He could have easily taken the throne when the king was killed. That was even speculated on this forum, but it didn't happen. Sean is an opportunist. That would have been his opportunity. He didn't take it which tells me he never wanted it in the first place.
The best way to frustrate a cyberbully is to ignore him.