I do believe he will plead guilty and I'm not sure he's going to get anything in return.
No matter what, he will NEVER see the light of day, of that I am quite certain. At his age, and with the ability to now sentence consecutively, (and I have seen it done 3 times recently), I would be surprised if he got anything less.
He won't be put anywhere cosy. He's going to go where all the really bad guys go. Can you imagine the uproar if there was a plea deal? Unless he's giving up more bodies and then I can see them doing something in return, but it wouldn't be significant I don't think.
From everything I have read so far, the evidence is overwhelming and compelling.
Maybe he's pleading guilty to protect HIS family. He isn't doing it out of the goodness of his heart that's for sure.
MOO