Great explanation C-K! I guess you nailed it.
Wish they had shown it in the series. But perhaps they will in the continuation, if it will ever happen. But hey, we can dream, can't we?
And don't forget the mysterious third brain the new Leader will receive. But I don't think it has anything to do with the word "brain" as lowly humans would understand it. I rather think it would be some kind of highly sophisticated computer chip which would boost up the promoted IL-Series' processing power and gives him the ability to read minds and such, like it was written in the TOS novels. What do you think?