I'll concede your point about Sekai. But at least he didn't constantly rob Fumina and Yuuma of having any character arcs. Divers is over half way through its run and it still hasn't given Yukki or Mono anything whatsoever. Koichi's entire arc was started and finished with his intro and he's done nothing since then. Ayame and Riku hogged all of the focus through the first half, and now the second half is promising to finally explain what Sarah's deal is. That means her and probably Riku will get all the spotlight once again leaving Yukki and Mono with nothing. Why even have larger teams if they're just going to ignore everyone in favor of yet another power trio (Ayame, Sarah, and Riku)?