Mrs. Strife fixes, well, not everything, but what she can. ShinRa is not so self-observant as to notice. The Energy Crisis is not resolved, but will somehow be fixed at some future point. Cloud Strife won't have to go back in time in this 'verse. Turks have a terrible sense of humor.

No one in their right minds would ever expect it of him, and that’s why he’s the one best-suited to the job.

By everyone’s agreement (except his own), Wen Ning was the sect leader. Of course, practically speaking, Nie Mingjue actually ran everything; he was the one with the experience in it, after all, and he claimed he was no good at teaching, which was the other thing they generally did. Other than, you know, the whole...fierce corpse thing.