He seems to have a little too much freedom to be that important imo. There are still alot of other candidates for the royal throne.
Bloody well, re-watching season 1 makes me think Saki is in dire need of mental help STAT. She dealt with/might deal with some really messed up stuff in her youth. I feel like Okouchi isn't allowed to go on his kill genki girl route that he loves so much that he's putting all his stress/messed up desires on Saki