DISCUSSION: How much backstory for the other JL members in their first solo movies?

Superman and Wonder Woman had their backstories explored in Man of Steel and Wonder Woman. Batman had his backstory explored in the Nolan trilogy, so WB was wise to move on from that with the current DCEU iteration of Batman. Aquaman will seemingly have his backstory explored in his solo movie being that there have been younger actors cast for Arthur Curry for different points in his life. The Flash and Cyborg will soon be appearing in their first ever solo movies. I would presume that some backstory will be revealed for them in Justice League (probably quick flashbacks). My question is, for their first ever solo movies, should we get to know these characters (Barry Allen and Victor Stone) more before they obtained their superpowers (assuming JL doesn't spend too much time on this). Should we get to see Barry's life before he became the Flash and see how he adjusted with his new powers? Same for Cyborg. Or should the movie just pick up where JL left off and not focus on what happened in their lives previously. via /r/DC_Cinematic http://ift.tt/2uVKEkU