Yeah that is one of the reason I thought it was easy, I thought as time went on Aigis would have grown and more things would have been added such as new units and unit type plus awakening thus making the game harder as well.
My other thought was maybe the revival event was easy so that it could be run along side another main event (which is not the case here) but this revival event doesn't seem to use the same system I have heard about from DMM's revival system, maybe they are working towards getting that implemented.
I know Nutakus Aigis is quite behind DMM's but I still hope in the future they hope to run revival events along side new events, though with things the way they are currently it may be awhile off. Still one step at a time and we are making progress towards a better Aigis on Nutaku.