In my continuing reread my own blog I'm now done with the Return to Angel Island arc, which, yes, still rules. Yes, it's time to praise that arc more. I wanted to go back and add a little more to my interpretation of that arc, because I don't think I could quite articulate this point as I was reading it
On top of the typical stuff about Knuckles needing to believe in himself as a hero, I think the lynchpin of Knuckles' arc here is this scene, which I kind of skimmed over at the time:
Knuckles believes that everything bad that's happened in the last year is his cosmic punishment for not choosing to ascend to pseudo-godhood like Aurora wanted him to after dying as Chaos Knuckles, instead returning to life to try and save his loved ones during the Xorda attack in #125
Obviously, this leads to all of the delicious irony that serves as the backbone of this arc. Knuckles has given up his godlike power, but the very act of returning to life has made his kind worship him as a god. They worship him even though he was powerless to stop Eggman from conquering the island. They believe he has the power to save them, but he instead has to rely on help from his greatest enemies, the Dark Legion. But, of course, in the end Knuckles realizes that he can still tap into the energy of the Master Emerald, he becomes Super Knuckles, and he saves the day at the last second. This might come off as a sudden deus ex machina, or even a total copout - shouldn't his ability to save the day come from within himself, not from the Master Emerald?
But zooming out, and taking the circumstances of Knuckles' resurrection and his view of all this as a cosmic punishment into account, I think on some level the arc is all about Knuckles finally forging his own path in life, after years and years of mostly just doing what Locke and the Brotherhood and Aurora wanted. He believes all of this is his punishment for disobeying, for straying from the path laid out for him by his superiors, for trying to do what he believed was right, for his ego. At the time, Aurora said that Knuckles choosing resurrection was the selfish option. His loved ones were fated to eventually die no matter what, but he had a "greater purpose." But in the end, his decision to give up ascension to go be a hero is validated. His refusal to back down from a fight is what saves the day and liberates Angel Island. (It's also interesting that when he powers up, he doesn't turn back into Chaos Knuckles, but rather Super Knuckles. No godlike mastery over all of reality, just pure Knuckles-style strength.) And I think what really drives this home is that ending, in which Knuckles finally stands up to Locke and says no, he's not just going to sit around on Angel Island while Robotnik takes over the world like the Brotherhood has done for the last 12 years. Just like how he told Aurora he wouldn't sit around in the afterlife while the Xorda destroyed Mobius. He's using his power to help others on his own terms, rather than letting himself be defined by a purpose given to him by someone else
Is this reading flawed? Probably. Locke gives Knuckles some words of encouragement before the climax, so he's not disobeying his dad by joining the fight, and Knuckles only ends up proving the Avatar prophecy true with his actions. But I still think it adds another interesting wrinkle to an excellent arc