One of the qualities that drew the Pittsburgh Steelers to Cameron Sutton in the run-up to the 2017 NFL Draft was because he was known to be an intelligent football player. Even at the college level, he said that he prided himself on knowing not just his assignment on any given play, but the assignment of everybody else on the field with him.
So the fact that he has had the opportunity and the ability to display his versatility in the secondary is no surprise. Over the course of his first three offseasons, he has played essentially every position in the defensive backfield at some point or another, even if it is simply in practice.