For clears in some colors people bring Akane, while for other colors they bring sKanna, despite having both. Why? Why not just bring the best one?

New Sensei wants to ask: What is the next raid boss going to be? Is it that big snake with high DEF on Grand Assault?

What are some good support students for him that I can use my Activity Reports on now to get ready? Akane? Who else? Do I need healers?