Well, he's saved, so far, three people: Kurenai, Flor and now Kaerikuro. Several people have saved themselves, and there have been other rescuers, like Kurenai saving Rokurou from committing suicide the previous chapter.
People have said this author normally kills his characters like flies. Now I think he's having fun making this bumbling wannabe illustrator save the strongest characters when they're about to die. But fundamentally, I think Souboutei is being slowly defeated by teamwork, and I find that very cool.