Fan Casting Knights of the force

Anakin wasn't the only one who had the possibility of being the chosen one. On a far planet, two brothers, twins were born with sensibility to the force and they're raised to be Jedi knights but destiny apparently tries to make one of them to turn to the dark side. Years later, just 3 years after "Revenge of siths" this boy is taken by Darth Vader himself. Almost 5 months after of "A new hope", with the destruction of Death star, Starkiller, Vader's student, make contact with the young man for a dark mission. Only his brother with a secret group of the resistance can stop him as the same time he tries to fullfil his own personal mission.