DT seems to be far too confident in something, rather than his usual "I think" he's pretty much said "He is". Not sure if it's because he knows something the rest of us don't or just because he is trying to be cocky in the hope people will take him seriously (knowing him, the latter is very likely :P ).
That said, I'm not entirely sure what he thinks he has on Zero. He's played with Zero enough times to know that when Zero isn't sure of who is scum he goes after whoever is voting him, it's pretty much classic Zero play, town or not. That he would overlook something like that worries me slightly and suggests he is just trying to get a relatively easy mislynch.
Also, to all those saying that Prof was going to lurk from his comments, I'm pretty sure that he was talking about whoever it was that he was voting.