Usage patterns
〈人〉は凡人にすぎないto be nothing more than an ordinary person
He's not a genius, just an ordinary person.
〈事〉は凡人には理解できないsomething is beyond an ordinary person's understanding
That artist's ideas are beyond what an ordinary person can grasp.
凡人の域を出ないto never rise above the level of an ordinary person
Technically, his work never rises above the ordinary.
