"display aptitude" is a correct and usable phrase in written English.
It means to demonstrate a natural ability or skill in a particular area. Example: The student was able to display aptitude in mathematics and excelled in the subject, earning top grades in all of their assignments and tests.
Many are not nearly good enough to do so professionally and a rare few, despite all the practice they put in, display less aptitude than an average member of the public.
With Maya, he has not exactly reprised the soft porn genre – although there is no lack of bedside titillation and descriptions of "stonking erections" and pert breasts – but he does display an aptitude in the marketable art of writing to genre.
In short, Mr. Thomas did not display the aptitude for service in the United States Air Force... [Emphasis placed in text by the Air Force Academy. --Ed.].
Newcomb displayed his aptitude for working with figures at an early age.
From the start, Mr. Cuomo displayed an aptitude for diagnosing problems deep inside a motor, eventually by sound alone.
Step forward Herschelle Gibbs, who would likely have become the second Twenty20 centurion had his team-mates not displayed more aptitude than Gayle's.
Braithwaite displays great aptitude as a teacher, but we are aware that there are lessons that he too must learn, particularly with reference to humility and patience.
He was educated at DeWitt Clinton high school and Northwestern University, where he gained a degree in journalism and also displayed an aptitude for drumming and telling jokes.
The movie, however, never strains for hipness, and Mr. Ruspoli displays an aptitude for the play of light and shade that transforms familiar setups into something fresh.
As he matured, he from time to time displayed the aptitude to manage his changing physique, along with the money thrown at his Nike-clad feet.
