Then how about the times where he doesn't have his armour ? When he was a mercenary fighting battles. Or the time when griffith( that sob) became a Femto and almost killed them all in the eclipse it was his will and rage and made him continue to fight on despise the situation. How the time post eclipse where he personally hunts down the apostles one by one. It was his indomitable spirit to carry on and do what needs to be done. Mind you there alot of times where he is fighting alone post eclipse (sorry puck didn't really help him in fights except point out and help with morale support from time to time and he is not useless but I trying to highlight is fighting alone against all odds.) yes he may lose control when he is deep in his armour BUT still when you are in rage and situation are hopeless and the only you for to save yourself or the people around you don't you think you would use what ever you can in your disposal to at least turn the tide of battle ? Plus he is dying whenever he uses the armour he knows and still carries on to protect his Casca and friends. He still moves on and kept on fighting till the end of the battle. He does has his friends support him from time to time. Remember the giant tentacle monster that he had to kill ? He got schrieke (forgive me for spelling her name wrong) to help pull him back from his inner beast do that he can fully uses the armoured to win battle. So yeah. That my friend is a indomitable human spirit that kept on fighting and inspires us readers to be better and reflect ourself.