Why is the movieverse so confusing. 2007: the Allspark is the only thing that can revive their race. 2009: the energon harvester is the only thing that can revive their race. 2011: Sentinel sends Cybertron to Earth to humans can revive the planet. 2014: the Seed is the only thing that can make transformers. 2017: only by draining the earth and giving cybertron life is the only way.
Are y'all seeing a trend here?