I mean, if you take at face value what Ratchet has told us, he's lost by way of his actions already. He's a pro town indie who has volunteered the information that he heals town and hurts scum and expects to survive however many cycles it takes to eliminate all threats to town. While scum have every reason in the world to smoke his ass.
Ratchet's a smart guy, but it doesn't really take one to tell you he's going down like the twin towers with this plan, unless he's either consigned to losing or nigh invincible. I could levy a similar criticism towards you but you apparently only have to kill one dude.
A lot of players have expressed their exhaustion at the Indi topic so I'll just leave it at this - don't reward this motherfuckers low cunning by allowing him to argue with a straight face that it totally makes sense he's still alive past D4. Just kill his ass if he gets that far. Seriously.