Hey everyone, I too am rather conserned about Greg (and Erics signing of seasons, sorry cant think of the right word!)
What I'm thinking that it might be about his book- and as it has got to the publishers etc, maybe an old mob does not like what he read.
Maybe the hostages and the person behind it is an old mobster etc.
Practically and logically for CSI to kill off another character so soon after Warrick, then I think it would be foolilsh to do so now.
Regardless of how many new ppl would have replaced them on screen the fan based and our love would still be with the older characters. In one season William and Gary left, as well as Jorja (although she left last season her reprisal of her role this season), for CSI to continue I can not see how credible it would be to have another CSI killed off.
Nor can I see how Greg being an informer. Not only would that be out of character, it would be so well...odd- and then to go back and explain his behaviour... somehow i dont see that happening.
I think that maybe Greg looses it, looses judgment or something like that and he missreads a situation.
Brass did it, Grissom did it, and so has Nick (guns pointed at him etc)
I think that more importantly that yet another mole or good guy gone bad would be hold news, and bad entertainment. Like I said earlier, we would have to see Greg's decline and be aware of his behaviour changes.