first of all revans armor was desing by the empeor when he first met him.
second i like very much revan and i am unhupy to say he die. he just destroy many things and die to give the republic time to recover thats why the empire attacked the republic 300 years after. and ofcource the republic and the jedi were so stupid that after the jedi war they werent afraid that this will hupen again and didnt create an army. after the sith took coruscant they create army.