I agree to a degree with what you're saying Masamuneehs. However (ya here we go), I still believe that Shinn had no real development. Shinn, in my opinion, does not go into this mad killing frenzy on just anyone. Instead, he just goes beserk and destroys whatever target he is supposed to or in order to defend himself. He's always been like this and sadly it will not change. Also, Shinn always wanted to do something with this war since it began. He wanted to put an end to it. Well, he just had no direction but now with the Chairman he chose a path in which he could end this war. I do admire Shinn for his well intentions, but the poor guy is just being led astray by his compassion. If anything, Shinn is a very compassionate and empathetic person. Shinn does not want his closest friends to go through any trouble or harm. It may be very well an effect that lingers with him from his family's death.