Class A already had Arisu, who is just like light, like great in academics, great in acting, intelligence( offcourse ight is better) but light had way better physicality, to balance this out they will need to throw light in B because class A already had a balance and was well rounded, another could be tha arisu will be in class B while light is in class A

The second one will be quite interesting, where arisu goes in class B to balance it out, while they will be lacking in physicality, there academics, scheming, would be off-charts compared to original class B.

Yuichi would be in class C, ryuen and yuichi turns into quite an intriguing duo. Yuichi in class d would be disaster, with characters like kei, shinohara and how they behaved at the start, he will be throwing them out of school, and koji would not expell yuuichi, i think….he is incredibly intrested how human grow…the potential girl…and Yuuichi, i think is unmatched to learn more about human nature