Badass warrior judged by others for his past profession? Decides to redeem himself after witnessing first hand the atrocities of the organization he worked for making him decide to fight back against the people he used to call ally? Betrayed by the one person he looked up to, and spending a good portion of the game, once again, seeking to come to terms with who he really is and whether he should let his past be the total judgement of who he is? Again, I could be talking about Mr. Strife, but that description fits Cecil Harvey just as well. Cecil's brother even has the whole alien genes allow me to control you angle that Sephiroth used on Cloud.
Cecil gets over his problems when he becomes a Paladin at Mt. Ordeals, which is, what, 15% into the game? It's at most a very shallow, underdeveloped version of what Cloud went through because Cloud's character development takes roughly the whole game,as opposed to a fraction of it.

Then there is also the fact you are simplifying things again. The tone of what Cloud and Cecil go through is not even remotely similar. Cecil's problems are linked to being a soldier for an evil army, and conflicting ideas of loyalty and morality. There's nothing like that AT ALL in Cloud's character progression.

Cloud does have trauma but it's not really the trauma that directs him. I mean Sephiroth uses the twisted memories of Nibelheim's destruction to coerce Cloud into thinking that following him was out of revenge but Cloud was already running away from who he was long before the mission, as is revealed in the entire Dream world sequence. Cloud never wanted to be who he was and this made it easier for the Jenova cells to twist him into who he wanted to be. It's not trauma, it's just his inability to live with the idea he is a failure to his own ideals that screws him up. Fei's issues are honest to god trauma, Cloud's is more self-inflicted which frankly makes him close to Cecil and Terra in my book as both also deal with trying to have their lives measure up to some personal sense of honor/good and normalcy that creates their problem and in all three cases the characters moment of triumph is finally realizing that their ideal is not the same as reality and that they have been living their ideal all along, even if wasn't to their earlier unrealistic expectations.
Now you're being ridiculous here. We saw the pitiful state Cloud was left in after being experimented on for years. He couldn't speak, he couldn't move on his own, he was barely alive. Years of being the subject of Hojo's mad tests will do that to a guy I imagine. I would definitely count that as trauma.

And then on top of all that the guy who was saving him went and got murdered right before his eyes.

You see it very clearly when Cloud first meets Tifa again in the train station. He's still a horrible wreck but there are those little "electric flashes" which represent how the Jenova Cells are scotchtaping his mind back together.

As I said, it's a combination of both personal failings and trauma.