Ever since Erwin’s life was exchanged for Armin’s, Armin has been expected to live up to the former commander’s talents to make that decision worth it.
He has suffered immense pressure, insecurity, and self-hatred at his perceived inadequacy for the task. But in the last few chapters, it has become clear that the decision to save Armin was the right one. He has proven that Eren’s argument for keeping him alive was accurate.
He was, indeed, the one to save humanity. He led the team which prevented the extinction of all peoples outside Paradis.
