User blog comment:Slug-Drones/Sonic Generations - Info (does not contain official announcements) *Possible Spoilers*/@comment-4346471-20110916152125/@comment-4331449-20110921073258

The events from 06 were erased due to Elise turning out the Flames. But well, if the Time Eater brings back other timelines , yeah , that's possible. It could be logical to put Silver as a rival and Sonic knowing him from Sonic Rivals, but if it's not the multiple timeline theory , there is no reason to put in Crisis City and an 06 basis for the character ( as known from the demo ) expect for fan demand ...