Great questions bring great answers... and also more questions. This one is a follow-up on Emperor that nominates a council that nominates the next emperor by Timst.
In the setting, an Emperor appoint a council whose responsibilities include the nomination of the next emperor when the current one dies.
Tim highlighted that this system would greatly correlate the interests of the state and those of the council members.
A later edit from Timst added that the council couldn't choose a member of the council.
At this point, I thought it would be perfect to disable a powerful suitor to the throne. By appointing this person to the council, he/she would be removed from the competition. Separatrix furthered this reasoning, stating it was no minor modification, as it would greatly impact the dynamic of the council (basically, passing the title around the council or scheming to get a majority and becoming emperor is out of question).
You could circumvent this difficulty, as a member, by ensuring your inheritor to be elected as new emperor.
But in the case of a member of the council coveting the throne but not being able to access it (directly or indirectly) due to the no-council rule, what means the emperor/the system could put in place to maintain the status quo?