When Zack died Cloud ended up completely shutting it out, which was why at first he couldn't even remember him, you can't feel guilty of what you can't remember.
Yes, he probably did feel guilty for the whole two years after the game. Which isn't really hard to believe, people go on their entire life feeling guilty over deaths they felt the caused, or could've stopped.
Oh your talking about that "Zack". Thats not Zack. Here look at my own picture to explain...
http://i189.photobucket.com/albums/z...ros/Debunk.jpg
The movie was riddled with symbolic and metaphoric scenes on Cloud's guilty. The wolf that appeared in the beginning but disappeared by the end, one could argue the entire geostigma struggle was a huge metaphor for his internal, seeing as he couldn't won until Cloud overcame his guilt.
