Not really a surprise that they'd be weak in terms of stat values being event obtained units but dang, Kan'u is really weak for a SR attack hime. Don't think I'll ever use her aside from leveling for jewels. Ryofu on the other hand will be extremely useful for dark teams since she the only 2 dark himes with B-frame atk/def down, other being Dark Amaterasu, which is time limited. Obviously not as strong as Sniper Shot but gives you more options than always having to use it.