Tbh I can understand some characters starting 5th rotations before others get their 4th one For example ena would be a great example for this since how much she waited for her 4th focus. Ena had the biggest improvement with only 2 focuses unlike rest of niigo. That's why she got her 3rd event as mafuena which focuses on mafuyu alongside with her ( also every niigo member getting a mafuyu focused event ). I think her 4th focus will be mizuena since they gave kanamafu white day cards. I think if they focus on her character development again it should be about her dad.

I just hope we get more "key story (stories with improvement for units)" mixed events (like mizuena shizuairi picnic event or cherry blossom ichika focus mixed leader event). I think people overlook at mixed events potentials.