Idk I am really big into the research on DNA and memories. Maybe it wasn't the right time for him to know...maybe it will be in the end when all of the past souls reincarnate (DNA recall) that He will know? So at the time of when they asked, he was unaware of who else he might have been. We all have tendencies to gravitate toward various tasks, books of the Bible, Names, etc. Sometimes these can be clues as to what we might have been/done in the past. Its not like someone comes and knocks on your door and tells you who you were...its just an innate feeling/knowing that you were set apart during that particular time/place. Many people nowadays are starting to feel different and are searching for their true calling/identity...the longing to go home :)