Based on Battousai's sampling
P(Town last to confirm) = 14/20 = 70%
P(mafia last to confirm) = 5/20 = 25%
P(SK last to confirm) = 1/20 = 5%
Assuming a 8:3:1 setup
P(random player is town) = 67%
P(random player is mafia) = 25%
P(random player is SK) = 8%
The only thing that can be concluded from this data is that there is a very high probability that the last player who confirms has a role in the game.
Missed a game, corrected in later post