These kind of rumours upset me. Not because they always turn out to be false, or how stupid they are, but because of the total lack of evidence. I mean, Photoshop isn't so hard to use, why not post some screenshots of Zack joining your party, or of Aeris coming back to life? When people point out the hoax, they'll be less insulting about it, because you'll actually have provided them with something vaguely funny.
Heck, go one step further and build a whole custom mod in which you can do all these things that are rumoured. Release screenshots for massive publicity. I'd do it, if I had the time. Also, if I could code. So basically, I will never do that.