My assumption in a mafia game is assume there's a doctor. It's one of the most common roles in the game. Nothing I said implied I was reaching for a conclusion of no doctor, it was trying to think of why the doctor wouldn't go for Drop.
I'll always do role speculation in game, being as open as possible is beneficial because it allows others to see my thinking and interject. The difference is when it comes to feasible roles and plays. I'll talk doctors, cops, killers because they are more likely to be present than not, more specific roles won't be discussed until they rear their head in the game.