This is probably because I started watching Bones only recently, and therefore already knew Cam didn't last long, but I like Cam. (Actually, given that she barely impeded B/B I was shocked to discover the amount of hatred for her. I mean, I get shipper hate. I hated both Hannah and Duncan for coming between LoVe on Veronica Mars...but Cam was...well, another story for another time.) I admire her very practical point of view and I think she conducts her duties with immense poise. But she, like Brennan, is very isolated in her own way, which I think you captured perfectly here.

The only time I've ever come close to third person omniscent is switching between people during a fic, which isn't really the same at all. I think so many novels use 3p limited that it's hard to wrap my mind around it when I write.