Halo Timeline confusion?

Spartan III's were actualy made like just a few years after spartan II's becouse of the outbreak of the human covenant war. Also kurt was a replacement for sam when he got killed on the covenant ship. When they were going to a old decomisioned station kurt had a explosive or something set in his fuel pack for his rockets and was launched into space then picked up by a oni prowler waiting for him becouse they planned it out so they could train them. i think they mention kurt as ambrose becouse of the oni officer who started the spartan III project and becouse kurt didnt remember his last name. Jorge was one of the 35 spartans that made it through augmentations but was unmentioned at first like kurt and just like Grey team. They dont specify that every spartan but master chiefs squad is dead they just say theyre marked as MIA which some actualy are. Got any more questions hit me up i have read all the books played the games and have halo encyclopedia, of course also beat every halo game on legendary. Also Spartan III's were made before reach just look at the dates they have on the books at the beginning of each chapter and compare them to halo: Fall of reach