No way the Chargers finish last in the AFC West. Although, if they don't find a left tackle to protect Rivers, he may get killed.
The Raiders, despite their acquisitions are a mess. They have no chance. Not Raider hate, just common sense.
The Chiefs are a joke. Their Jekyll and Hyde routine will almost certainly lead to another season of wild inconsistency and overall mediocrity.
The Donkey's... Defense is damn good, but Chump Bailey is on the decline and their pass protection is weaker than it has been in a long time. Being great at stopping the run game won't be enough when they play against an aggressive passing team led by a Marquis QB.
Peyton Manning is a whole lot of eggs in a single, very old and frail basket. As he goes, so shall the team.
I think the division will either go to SD or Denver, but my money is on Philip Rivers.