Transformers:Origins is like my "Generation 1". It takes place on Cybertron, before the events of Transformers:New Beginnings, in the Eighties and the start of the Nineties. It starts in January 1980, and ends in January 1994. I retcon the fact that Optimus was Prime before New Beginnings' crap, so that makes Jazzimus still Prime, here, but in a different way. Optimus and his Autobots still died, but passed the Matrix to Jazzimus. (Another way of explaining it without randomly retconning stuff)