[Minato nods. Exactly what he was thinking.] I thought so. Like Souzen-san.

[He addresses Chou, to explain.] We've seen this before. There's someone else here - Seito Souzen - who looks exactly like someone Shirogane-san knows, but his personality is different. Seems like he's from a world extremely similar to ours, but still another world. Same thing with you, which is why Shirogane-san doesn't know you.