anne I think that Greg could totally be the next Grissom, I've always said that he has the smarts of Grissom and the empathy of Nick and that is one great combination.
I think that Warrick does like him, remember in "No Humans Involved" when Warrick was talking to Mia, he got that phone call, she thought he was a player, all the time it was Greg calling because Warrick had called him to make sure he was okay from the tough case from the night before.
Maybe "Sanders" is just the way he refers to him, some people prefer to call some people by their last names as opposed to their first names. Granted pretty much everyone calls Gil by Grissom, but maybe it's the same way for Greg with him.
Just have to add, between all the promos, I'm really hoping that they infact don't show a lot of the beating, while it is a vital part of the story, it's still Greg and it's just nasty to watch.
His face really is bruised and bloodied, and I can't even imagine with the kicking how his torso must be bruised as well.
Which, okay, will mean his shirt just might have to come off--there may be a little ray of light in a terrible situation.