Cobar was tortured to death by King Shadow in this altered timeline.
Flynn had said he didn't really see a point to Cobar at first, seeing him as just another scientist role that Rotor or Tails could easily fill.
Sonic returns from fixing his past mistakes in the past off-camera. The world looks different. King Shadow rules with Sally, and everything is wrong. Rotor has been imprisoned. But where is Cobar?
@Cubbywastaken @Seiidou_@ProMenKisser@Noodledori1 A LOT more. Check it out. Chapter 34 is where they split, but everything up to that is shot for shot exact with the anime