Don’t forget that the timeline in the show is significantly changed already. Several events such as Mark’s first trip to Mars and DA Sinclair’s Reanimen didn’t occur in the comics until after Omni Man had revealed his deception and fled earth, for example. They’re switching up the sequence of some events, presumably to better fit the show’s format.
Well it also explains why several recognisable names (Clancy Brown, Grey Griffin, Phil LaMarr) are voicing multiple people in the show lol.