Is Leonard a Whispered?
I think some of this is not revealed in TSR, so I've spoilered it.


   Yes, he is a Whispered. Not only that, he exceeds his sister's abilities both physically and mentally, and he used his knowledge to produce Arm Slaves for Amalgam. I don't think we know for sure how/why he became the leader of the opposition, though it's implied at some point that primarily he wanted more freedom.


Source: Wiki