I don't think the author understand the concept of chaos as alignment... Truly chaotic being wouldn't even dream of being king. As that is way too much order... Now evil maybe...
Anyone ever wonders how come these "big shot" families have no proper spy networks and why don't they properly inform their useless idiotic young masters?
Hmm, gate magic is fun tool. Just build and vacuum tight chamber, set gate between it and space. Then at the top and bottom set a gate pair. Drop suitable mass inside, let it reach near light speed. Handy kinetic weapon...
Also what is the issue of not being nobility? He could just ask the uncle and be given some land... Or take the former empire it is up for grabs after all..