Even if you are not the chosen one, you can be a made trader by spending time in the field. In addition, you can become an expert in trading in just six months by giving time to the important aspects. So I think there is no difference between a trader born or made. What matters the most is the value that is generated as a result of the trading.
Practically, I believe these two types of traders are always existing in this space. Because, it will not be possible to have some extra perceptional knowledge for all the people but it is a knowledge by birth. This way, some people may born with extra sense on catching anything sharply and obviously anyone can turn into professional trader for sure by learning and practicing.
In think that both the conditions can be satisfied. Sometime people have natural and God gifted skills of trading. Their analysis are always too much effective. While some people may not have these qualities, but still they are good in trading and the reason is that they have spent a lot of time in the market and they always give a good time to trading and to the market, so they are not born as traders but they have been made.