i did get permission to start this thread from Chris himself.
i would like to try and make further sense of the story time line, so i would like to attempt and prove that Cloud and Zax were held by Shin-ra for five years.
Hypothesis: Hojo kept Cloud and Zax in the Shin-ra mansion for five years.
supporting evidence (gathered from Last Order and the game itself):
1.) In the short animated film "Last Order" Tseng, leader of the Turks referrs to five years ago several times. this only makes sense when Cloud is 21 years old (the age he is in the game), and after the Sephiroth incident. Five years before the Sephiroth incident Cloud would only be eleven years old. In the game we are not given any memories of Cloud at age eleven (i believe the youngest was twelve or fourteen).
2.)After Cloud escaped from Shin-ra (when Zax was assassinated) his mental state of 'diminishing consciousness' is much the same as when Tifa finds Cloud at the train station in midgar, only shortly before the first AVALANCHE bombing mission.
3.)Cloud and Zax were walking/hitchhiking from Nibelhiem to Midgar. It does NOT take five years to walk to Midgar. It would injure the entire story line if every trip to Nibelhiem and back took five years.
4.) Hojo would need time to study the effects of Jenova and Mako Radiation Therapy on his 'specimens' Cloud and Zax (five years perhaps?)
5.) there is a gap in Clouds memory. We have the escape from Nibelhiem, then nothing until the first bombing mission.
I also believe Cloud was poisoned during Hojos experiments, due to the comparison of his mental state after Hojos experiments, and his mental state after he washed up on the shores of Mideel.
http://www.youtube.com/watch.php?v=3T55QS1psSw (Link to LO)