Angel - yes I'm suspicious of creepy Partridge, but as a disciple not RJ. Because he's too skinny - I know, useless logic but that's my instinct I also think Laughlin will turn out to be a baddie of some kind, but did he arrive on the scene too late to be the mole
I'm starting to think I should be looking at all the people in the background and the ones who escort prisoners and guard suspects. There's probably someone with a non-speaking part who's often around, but I never really notice what any of those people look like. When RJ is revealed, we'll be shown loads of clips from previous episodes of this guy working away in the CBI offices.
Jude - I'm not absolutely sure about the toenails thing. I know Patrick's wife was the first victim to have this, and I think you're right that the girl in the Season 1 finale also had it done. I don't remember it being mentioned for anyone else. But I definitely think that RJ is only directly responsible for some of the murders, and as you say others have been done by disciples, just from a practical point of view as much as anything else. After all, RJ isn't superhuman so he can't be everywhere.
If the toenails thing is his personal signature, then its something he started doing when he killed Jane's wife. Because we know he was directly responsible for at least one murder before that - the one where he left the forensic evidence that he had to conceal in His Right Red Hand.
Call me crazy but I've toyed with the idea that perhaps a disciple murdered Jane's wife rather than RJ himself. My only reason for thinking about this is because I thought it might be a good twist for Patrick to catch RJ and then discover that he hadn't caught her killer, so then the hunt would have to start all over again in the next season.