Carlito in the chamber? Pfft yeah right. Triple H is coming back at the LATEST @ Summerslam. It's a long stretch with this elimination chamber, because I personally haven't heard any rumors, but if they do, I pick HHH for the 6th spot over Snitsky. They haven't even built Snitsky up on RAW enough yet. His time is 2008 I heard.
As for Orton becoming number one contender, there is no way he can beat Bobby Lashley. Maybe by cheating, but that's been done before too much. I predict Lashley loses to Cena, then goes on to feud with King Booker. Orton beats Dusty at the Bash while they hype up Dustys son who then feuds with Orton, only to lose to him, giving Orton a gentle push (since this is the son of a legend.) Next, Orton carries a feud with Kennedy, perhaps fighting over who should be number one contender. Orton goes on to defeat Kennedy, then settles the score in a feud with his old-time pal, Triple H (perhaps stemming around the Unforgiven PPV). Triple H will either put over Orton for a singles match with Cena at Wrestlemania, or they will have a triple threat match for the title. I personally think Triple H will put Orton over, then have his own feud with Booker, while Cena and Orton face off at Mania for the title.