The problem with this thinking is this "aptitude" is something which comes naturally. I was drilled with this "aptitude" nonsense when I was a student where the teachers would say that if a person "gets" a problem and finds a solution then he is a natural for the subject.

In my practical experience I find that to get the "aptitude" requires a lot of effort put in it. It definitely would vary depending on the person and his experiences but practicing it is very important to go forward.