Thurman
If Frost's gone officially braindead, then at least she's got her looks to fall back on. Ha ha ha.
I'd likely have to recommend Wilson then, and that's even if I haven't talked to that particular brand of insane here. Not yet, at least, and if one's lucky, then they can live their lives without being confronted with the crazy. I do recall that he was an excellent watchdog to sic on someone. Downside is it might annoy the fuck out of the intended target. But at least they'd be tracked down, which is all that matters, and if he can heal himself...then cutting him to shreds would be an unfortuantely moot point.
As for those telepaths, I'll leave them to you since your mind likely resembles scrambled eggs. They set me on edge, the same with most people who work in government or law enforcement agencies. Luckily I remember my training from sleepytime land, or I'd be buggered.
Even so, I'd be wary of Grey going nutters with dual-personalities, but if she's in control of it here like maybe she seems to be? Then it shouldn't blow up in everyone's faces. I hope.