I consider it less valid as it was created to just make money, the very existence of it wobbles the foundations of the FF7 world/story.

And Cloud defeats Seph multiple times and Jenova and the Turks and Shinra and the Weapons, **** me Zack aint got shit on Cloud

Plus Zack died outside Midgar, nowhere near home =/

Perhaps Cloud was having a bad mako trip and was coming down badly and Zack was still buzzing, having an imaginary battle against 1000 soldiers in the space of 3 seconds, heck as long as were assuming and making shit up lets go hog wild no?