This sort of development actually makes sense. Anoth literally comes from a time where marriage, the relationship that is ideally with the person who you trust most, was handled through absolute contract. Of course he would tag the Sceptre with a tracker. Even if the upper echelon wasn't obviously tied up in anti-Anoth conspiracy bull.
Which means that this is one of the better written pwnings we've seen so far.
@wankerLin Not exactly. The whole idea of aristocrathy contradicts the way Maou is distinguished. In fact, whole school project comes as kinda justification for noble rule by providing noble children with exceptional conditions to seize full power.
To put it simply, demon king is not defined by bloodline (not traditional king), so noble families put their children in superior position so that they can make the noble blood AND the title of power one and the same.