There should be a game dedicated to Sage, maybe his life story up until the point he meets you, and then at that part you can even redo the scene from the first but Sage makes the final decision, or maybe Sage went solo after everything went bad and he couldn't take it anymore. I like how much he changed over the games, and I got really attached to him.
I suggest you continue on with the series, At least drag it on like the Sagitarian series which I'm ashamed to admit I ignored because I thought it didn't deserve the time of day. I was wrong, and this game proved it. I love this, and the Sagitarian series as well, please don't end this just yet.
Out of all the stupid, awful, terrible, and just wrong! Zombie games there is out there, someone finally did right! Hyptosis, this series was by far the most entertaining zombie game I have ever played, I hope it isn't ending so soon.