The thing I find curious is that Stogi didn't die. Could have just been a mafia oversight, but Day 0 he claimed doctor, and in the rules it states that the doc can't save themselves. So they could have easily made the hit and take the chance that he actually is doc.
It was probably just a bluff on Stogi's end. But in any case, it's still odd.
Claiming to be the doctor and actually being the doctor are two different things, so it paints a target on him which means the real doctor can pick him to save. Pretty neat game of chicken. I doubt the real doctor would out themselves like that so that is why I'm fairly certain he's just a regular townie but he could be a lower level mafia member also, wolf in sheep's clothing sort of thing... However if that is the case, Bravo!
Edit on the same line of thinking: Usually the Godfather is immune to investigations, so he may show up as townie anyway if he was mafia!