The fact that nobody has posted in here for four months usually means you'd be better off starting a new thread, but since this is a sticky it's okay.
I don't know the answers to any of your questions, though, because I haven't played FFX in a really long time. Sorry. The key items might be from events that you missed. I'm not sure though. @_@
edit: rofl, I didn't even look to see if this was a sticky before posting earlier. Sorry.