The thought in the essay is good, but writing is too long and suffers from repetition. At least from my point of view.
Anyways, the thing with talent is that I partly believe that anyone can basically do anything if they want. But, this is probably not so. Generally anyone can do anything if they train hard enough, but then there are some exceptions. There are people who really don't do well in some areas, while might excel in others. I'm thinking of autistic persons, or persons having Asperger's syndrome, there are surprisingly many of people who suffer from these in the universities. They tend to be incredibly annoying, simply by asking unrelated questions from the lecturer or the assistent. It will probably be extraodinarily difficult for them to go-along with other people.
Mika
btw. Who does the assitant assist in the university? Professor or students?