Chargers: Grades for every player through four games

Chargers grades:
Sean Culkin
PFF Grade: 50.6
Stats: One reception, 12 receiving yards, no touchdowns, 68.8 passer rating when targeted
Grade: n/a (not enough snaps)
Tearing your Achilles sounds like one of the more painful injuries in football, and Culkin did just that. Unfortunately, this may spell the end of the young tight end in Los Angeles, and just like with Green, it looks like Kendricks might have a little bit more to offer.
Grade: n/a (not enough snaps)
Mike Williams
PFF Grade: 66.5
Stats: Eight receptions, 157 receiving yards, no touchdowns, 96.4 passer rating when targeted
Williams, when healthy, has been exactly what the Chargers need out of their No. 2 receiver. He won’t ever post No. 1 numbers with Allen on the field (as well as a dynamic rushing attack), but he is able to make some incredible plays for the offense.
When he returns from injury, the Chargers will have nearly every piece of their 2018 offense back together, just in time for a battle with the Bears or a shootout with the Packers.
Grade: B
Geremy Davis
PFF Grade: 62.5
Stats: Two receptions, 25 receiving yards, no touchdowns, 118.8 passer rating when targeted. Three special teams tackles.
Grade: n/a (not enough snaps)