User blog comment:Suni-re/S4 Selection 2018?/@comment-26426093-20170926063725

Ako and Mahiru will both keep their positions for sure. The former class didn't introduce a inter-class rival who was strong enough to challenge Ako, while in the latter class, Koharu still doesn't have what it takes to challenge Mahiru for top spot.

As for the Dance Class, barring the impossible scenario of Laura switching classes, Ruka is bound to take over Yuzu's place. This in turn will create an odd situation where a side character who has barely featured in terms of screentime is going to become a "main" beside Mahiru, Ako and Laura/Yume.

As for Yume vs Laura, I really wished that both of them could have been in S4 together. Especially Laura. But now as it stands, I think she is going to keep wearing that admin uniform for a very long time.