This is where the story actually got quite difficult. At this point, the Hero story and Dark story start to contradict each other. Before, there had been minor differences such as those about who won certain fights, but then they each had the same cutscene afterwards anyways, so it was easily fixable. But much larger difference started to show up here, which you almost wouldn’t notice playing the game casually. For example, in the Dark story, Eggman defeats Tails, takes the Emerald, and tells Shadow to deal with Sonic. But in the hero story, Sonic makes it back to the ARK, defeats Shadow, puts the fake Emerald into the Cannon, and makes it back to the outside of the Research Lab just as Tails defeats Eggman. Time wise, it just doesn’t match up. Then, of course, there’s the problem of which Emerald actually makes it into the Cannon (which will be given an in-universe explanation in the next part). In the Dark story, the Cannon doesn’t explode, it just fails to fire and then the colony starts falling. In all technicality, the Dark story actually makes more sense to be what really happened, since the Cannon is in working order and is fired in Shadow the Hedgehog. Problem is, that would make for a terrible story if Tails failed to beat Eggman and then Eggman accomplished exactly what he set out to do. So, Tails beat Eggman, but Eggman still stole what he thought was the real Emerald, which, in the only explanation I could come up with, Sonic used Chaos Control to swap with the real one (and I had to add a few seconds to the timestamp to allow Sonic time to do this in a scene that didn’t exist in the original). Sonic never actually went back to the Cannon himself, allowing the timelines to line up a bit better. The only change left was to have Eggman tell Shadow to deal with Sonic during his fight with Tails instead of after.
As for other changes, the first major one was to add a thought to Shadow’s meeting with Sonic after believing him to be dead. In the original, Shadow first says that he believes Sonic’s Emerald is real, but then almost immediately turns around and accuses that Sonic can’t possibly have used a fake to do what he did. So, I felt it necessary to add a thought in which Shadow specifically realizes that the Emerald isn’t real like he thought it was, allowing for a more smooth, entire thought process to be expressed. Lastly, after Shadow’s statement upon being defeated, I added one last thought, suggesting that Shadow was, at some point, informed by the Professor about a being equal in strength to his own, able to use Chaos Control. This was a lead-in to the Chaos Project, in which I will be exploring the many memories which Shadow has still failed to recall in the present. And that will be all until next time, a special double episode for the Final Story, in which Sonic Adventure 2 reaches its final climax.
– Until then, remember to live and learn every day!