If you played Crisis Core, you'd get what is going on.

Edited August 20, 201510 yr by TheFinalPersonaKeyblade

One day, Hercules will go down to the Underworld and find Zach's soul kicking around.

Zack can't die. Aerith is still alive although she supposed to be dead.

Ven's in a coma and Zack's either filled with bullets or Sephiroth wounds.

I always liked to imagine that the universe of Kingdom Hearts is like some parallel dimension for the FF characters. For example, some kind of alternate dimension where certain events never happened due to certain choices not being made. For example: in FF's original reality, Aerith is killed by Sephiroth, but in the reality of KH she's still alive due to some kind of  alternate happenstance.  Maybe that would even explain why in KH2, Cloud just kinda stops and stares at her for an odd moment, because he knows that she's not the Aerith from his own time/ reality point. With this odd idea in mind, Zack could still be alive, or at least an alternate, Kingdom Heart's universe version of him!

 

 

Ow, my head hurts...

I always liked to imagine that the universe of Kingdom Hearts is like some parallel dimension for the FF characters. For example, some kind of alternate dimension where certain events never happened due to certain choices not being made. For example: in FF's original reality, Aerith is killed by Sephiroth, but in the reality of KH she's still alive due to some kind of  alternate happenstance.  Maybe that would even explain why in KH2, Cloud just kinda stops and stares at her for an odd moment, because he knows that she's not the Aerith from his own time/ reality point. With this odd idea in mind, Zack could still be alive, or at least an alternate, Kingdom Heart's universe version of him!   Ow, my head hurts...

About Zack....Sephiroth could've killed him in KH.

I always liked to imagine that the universe of Kingdom Hearts is like some parallel dimension for the FF characters. For example, some kind of alternate dimension where certain events never happened due to certain choices not being made. For example: in FF's original reality, Aerith is killed by Sephiroth, but in the reality of KH she's still alive due to some kind of  alternate happenstance.  Maybe that would even explain why in KH2, Cloud just kinda stops and stares at her for an odd moment, because he knows that she's not the Aerith from his own time/ reality point. With this odd idea in mind, Zack could still be alive, or at least an alternate, Kingdom Heart's universe version of him!   Ow, my head hurts...

The simple answer for alternate dimension is more on what happens when they don't have the same origin because they are in a completely different setting. Yes, it's a cameo. But not one that is Canon to ff7