Well, if you'll notice, we're currently in the middle of a pretty informative back and forth exchange on the subject. Even CnC has posted some concrete thoughts on the subject....you're the only one that hasn't.
Try to stick to the topic.
Eh, the factual reasons for why your opinion is wrong, based on the evidence in the manga, has been stated repeatedly and at length; there's no need for me to repeat them.
And again, in a conversation about emotional changes in character and characterization, logic has nothing to do with it.
Nobody's trying to prove anything here; you asked for proof of character complexity, and the reasons for character change and development - it was given. Your refusal of that evidence doesn't change its existance or factual nature. Specific events happened, to specific characters, at specific times in the manga - and based on their characters, they changed in believable and predictable ways.
I think at this point it would help is all if we maybe clarified what's trying to be shown here in simple point-form. Starting to get a little sidetracked, and I know for my own comprehension, RedDevilFC, I really do want to understand what you're trying to ask, so that we can more accuratly help you understand the character development you seem to have missed.
The evidence and proof is stated very clearly in the manga, and even more clearly by previous posters. That... I don't even know what point you're trying to make anymore, other than that you're emotaionally attached to your idea in the face of overwhelming opposing evidence. That's not logical!