I noticed something interesting about Kuroda that is from his third duel onwards He has been using Ritual Archetypes. We first saw this when he use Drytrons againts Shoma in a locals. Then He show up in the post time skip with his first duel against Souta with Libromancer. Then his duel to...
Simple, she has a dedicated wing woman in Duomoto. Since, as you said, she is the weakest individually of the three losing heroines, it's kind of clever that she is the one who was some sort of support.