So day 4 was almost as bad as day 3. Really, why wouldn't droz say who he watched? He obviously watched chap. If he didn't, kill him. It's not a tough concept.
I have a theory for this. It is something that popped into my mind immediately, once Droz stated that he didn't want to reveal what he saw.
He most likely did watch Chapcrap and saw someone visit Chap. However, he has no idea whether the visit was positive or negative. All he knows is that Chap didn't die from it. Droz likely wanted to wait and see whether something negative happened to chap (role-blocked, bus-driven, silenced, etc). Chap had been inactive the previous night & day, so there was no way to find out for sure. For instance, he may have been blocked. But since he didn't use his role, a block was fruitless anyway. Also, there would be no way to know, since he didn't try to use his role.
In short, if Droz doesn't know what the person did, he may not want to say anything just yet. It could just lead to unnecessarily attracting attention to a player before the proper time.
Just a theory, and I could be wrong, but that is my hunch so far.
Bruceswar: I have big news coming out soonish
Violet: oh, what big news?
Bruceswar: I am leaving KORT to go to RA