Why Jacob Can Only See One Leader at a Time
I think there may be a very logical explanation as to why Jacob’s rule is that only one leader can request an audience with him at a time. Jacob knows that MIB cannot kill him, and that he needs to find a loophole. That would mean that the day MIB found his loophole, he would probably want to be there to make sure his loophole gets the dirty work done. That would mean 2 people would be requesting to see Jacob, MIB and the loophole killer.
Could Jacob have made the rule as a method of protecting himself from his inevitible death? It seems logical.