Going to post this before I'm off for the night.
GmK seems to be influencing many people - do not go along with him unless he is proven to be clear. In fact, don't trust anyone unless they are proven to be town by any means necessary, be it a doc save, roleblocker cross-check, or cop inspection.
How does a doc save prove innocence?
If a doctor saves someone, that person could ask 'Who saved me last night.' If no one answers, no one can be proven innocent, if one person answers, then that person is a most likely a doctor (the only exception is when the doctor wants to remain silent for want of safety), and thus is innocent (but, if revealed, is also most likely dead the next day.) If more than 2 people answer, then you know one of them isn't telling the truth, and one is (assuming the previously mentioned scenario isn't occurring.)