I'm sure there is a thread about this somewhere, but I'd have to search around in order to find it. :lol:
At any rate, you're absolutely right that Cloud did not completely become Zack. He did imitate some of Zack's mannerisms, but the FFVII Ultimania Omega has made it clear that the real Cloud continued to exist during Disk One of FFVII. In fact, it says that there were actually
multiple personalities existing in Cloud during Disk One, and that the real Cloud was one of those personalities. The FFVII UO also goes on to say that Aerith was able to discern the real Cloud due to her Cetra abilities.
The "coldness" that you asked about in particular was, in fact, the real Cloud showing through. Here's two quotes about that from the FFVII Ultimania Omega:
In fact, the real him has no actual training to be a SOLDIER, and the cool attitude put on by Cloud is to hide the loneliness caused by his earlier social failures. ~FFVII Ultimania Omega, pg. 11
After developing his personality by using Zack's memory as a base, Cloud still maintained the part of coolness even though Zack had cheerful characteristics. The part of Cloud's coolness that keeps him away from the surroundings and the part of his asserting “no interests” all have nothing to do with the influence of Jenova cells. They belong to the real Cloud’s personality. ~page 180, FFVII Ultimania OmegaSo the anti-social personality seen in Cloud when he first joined Avalanche was part of Cloud's true self. This was, in fact, how the young Cloud coped with his lack of social acceptance in Nibelheim and so was part of his true nature.
According to the FFVII Ultimania Omega, some other indications that the real Cloud existed during Disk One include:
* The mysterious voices that spoke to Cloud during Disk One was the subconscious of the real Cloud.
* The dream that Cloud had of his mother when he slept at Elmyra's house was a memory of the "real Cloud".
* The "child" version of Cloud seen on different occasions represented the "real Cloud".
* Cloud integrated part of his "real self" into his functioning personality when his Jenova cells mimicked Tifa's memories of him.
* Certain memories that Cloud had - such as finding orthopedic underwear in Tifa's room - were memories of the real Cloud.
You can find more about it in this article on my website:
The Real Cloud