A long time investigator we were teaching when I was out with the missionaries mentioned something I thought was a really good observation. They were asking why more of Jesus' life is not mentioned to the people in the Book of Mormon. He was basically saying that there is more about Christ's life and teachings in the Bible because of Matthew, Mark, Luke, and John than there is in the Book of Mormon. I explained that is because the Bible speaks about when Jesus was born up to his death but the Book of Mormon is after his death.