FF VII universe plot questions

I’ve played FF VII clear through a couple times, also played Crisis Core and viewed the Advent Children movie. Never played the phone game about the Turks or the PS2 game that centers around Vincent Valentine. The conclusion of Crisis Core left me with a couple questions:

  1. What was the big deal about Cissnei’s “real name?” She mentions a couple times that Cissnei isn’t her real name and it’s made out like this is important.
  2. What becomes of Genesis? At the end of Crisis Core, he isn’t dead. We see him loaded into a chopper by a couple Shinra grunts. He isn’t in FF VII and I don’t recall him being in Advent Children. There must have been a point ot having him survive when it would have been simpler, plot wise, just to kill him off.