Clive and the other low rank magical researchers make no sense
Obviously Clive is higher rank NOW, but the fact that he was doing ground breaking research at iron rank makes no sense. Not that he isn't smart enough to do it, but the books explain that as you get higher in rank your intellect goes up and you literally get smarter. If your physical capabilities from normal rank to silver evolve that drastically, then mentally, it has to be like going from a smart guy to a genius. And we know that there are plenty of silver and even gold rank researchers in the magic society doing work as well.
What is really weird is that all of these high ranking people call Clive a 'monster' for how intelligent he is and even go as far as basically imprisoning him to work non-stop. Even if he is a genius by normal rank standards, shouldn't an intelligent silver ranker still be significantly more intelligent?
The way the mental attributes advance just doesn't make much sense to me.