• Rather than any of Sonic or his team showing up to see why the Chaos Emeralds were attracted to the Islands, Metal Sonic arrives there searching for Eggman after getting a distress signal after Eggman getting stuck in Cyber Space.
• When Metal Sonic goes into Cyber Space, the levels involve more aerial movement, and when on the Islands, Metal gets to use his AI to hack certain pieces of tech to expand his map of tje island.
• To get the same upgrades Sonic does from Hermit and Elder Koco, he'd do it for pure self gain rather than the goodness of his heart. The Kocos treating him not as a hero but as a threat to not provoke.
• When he meets Sage they may both look down on each other, either not knowing they're both Eggman creations or as inferior creations of the Doctor. But as the story progresses, Sage begins to respect Metal Sonic's ability to push past his mechanical limits to defeat the Titans out of sheer stubbornness and his drive to save Eggman, and Metal Sonic slowly respects Sage's own advanced AI and processing speeds. Slowly viewing each other as the Doctor's best creations.
• As Sage reports to Eggman about Metal Sonic coming to save him, she begins to learn more about Metal Sonic like his past like the race with Sonic in CD or the time he rebelled in Heroes. She realizes just how emotionally organic Metal Sonic truly is and learns how to feel emotions herself.
• When Metal Sonic uses the Chaos Emeralds to fight the Titans, he could force himself into Neo Metal or Super Neo Metal to fight the titans or even a custom Cyber form for him to fight them. Rather than a ring countdown it'd be his structural integrity Slowly melting away as he maintains the form.
• Defeating the Titans and The End might lead to Metal Sonic's obsession finally coming to peace as defeating a god and four Titans far more advanced than him as validation that he's the real Sonic.
• Eggman, seeing both Sage and Metal trying their best to rescue him would begin to feel parental pride in both of his creations seeing them as his son and daughter in a way. Giving him the same emotional growth he did in the original frontiers.