Expect a bounce back performance from Philip Rivers returning to LA after a tough game last week at Detroit. Austin Ekeler has proven he is more than capable of replacing Melvin Gordon even being a better pass-catcher out of the backfield. 
Deshaun Watson is due for a better game, too. The Texans are facing an easier defense than the Jaguars. Watson has all of his main receiving targets healthy. 
Both teams are vulnerable in the secondary. The Chargers are missing their starting safeties. They draw Watson after facing Jacoby Brissett and Gardner Minshew during their first two games. That's a monster step up.