Early morning thoughts:
I'm thinking that some others are correct and we have totally misfired on who we thought were mafia. I know I've been critical of rb's hints before, but I'm willing to take them on this time. So Grins, for now, you're off the hook. I retract my vote for Grins.
First let me say something about statistics. The problem with us having a 33% chance or <shudder> 50% chance of lynching a mafia today is that those percentages presume that all other things are equal and we know that's not the case. Some people will be defending themselves, some attacking others, some defending others. So, just throw statistics out the window after day 1 (even on day one pretty much).
Now for my list... again based on some hints that rb threw out (and my interpretation of them) I'm listing the following as my top mafia choices:
JMax - she's a vet player and made some very interesting statements about this game (especially recently)
Ice - definately not my top choice, but there are some curious things going on here.
ZSand - His posts are similar to the time that he was mafia and I busted him on it. IMO, they are good posts, but lacking that effort towards innocence.
The next one would be one of Mad, Hooked, DD with me leaning toward DD. She's a very quiet player that hides well. Hooked is more aggressive, so somewhat easier to see goofs or slips. Mad is probably lowest on my list for mafia right now, but it would be a mistake to not look at him closely. He posts infrequently, but they are usually excellent posts when he's innocent.
I'm also curious about the assumption that one of Zsand and KOTD came into the game as mafia. I realize that this is based on rbs posts, but I don't think that was the message.
Unless we can pretty much through the rules and stated objectives out the window, then we are looking at 6 mafia now out of 17 players (two deaths last night). With two innocent deaths today we would be 6 of 15 and the blackmail might come into play so 6 of 14... still not 50/50.... wierd....
Of course, if the detective is mafia, then we are in serious trouble anyway.
Ogre, why must we always end up butting heads.

Now on your discussion of numbers I must correct you. There are 18 players left, and 3 Innocents died yesterday. (joander, malbri, ILB) You are correct that there are now probably 6 Mafia (2 Dons, 2 Day 1 picks, and 2 Day 2 picks). So 6/18 If two Innocents died today that would be 6/16, add blackmailer 6/15 possible.