[@NylaofShadows] Most of those holes you mentioned are filled in by Negi's character bio. It goes into more detail about the planet's destruction and how and why he's been able to hide on Earth. And even then, the hiding only lasted five years before he is found by the arriving Saiyans. And the timing if the destruction of the planet is important, it happened 5 years before the game starts, and Negi and Okuras war happened immediately afterwards. According to Chayots age, she would have been 18 at that time, so we'll old enough to be aware of it and even have a stake in its outcome.