I think it's one of those things. I also think Minako-san's in the minority as leader for some reason, since her friend now is the first one she's known of here who knows her.

In any case, their stuff was two years before ours, so the memory wipe might've been because remembering that could've changed how things unfolded, and that would just get messy.

[Especially with the high stakes the Iwatodai group was up against.]