Roberts and O'Connell are in the top tier of legal minds abroad in the land it appears. Roberts was first in his class at the most selective law school in the nation (and how top tier law school applicants sort themselves out is on a national basis - one goes to the "best" law school one can get into regardless of location. I hoofed it off to Michigan Law School because that was the best law school which chose to admit me). That to me suggests genius.
I have come to be niggardly in applying the term 'genius' even to those so obviously above my level.