All of the receivers played very well last night, and it seems like the Chargers are all set at that position.
Malcolm Floyd showed real number one option ability. He made some extremely athletic catches and seemed to be there when Philip Rivers needed him. He consistently got open when left in single coverage, and he ran great routes.
Legedu Naanee also played very well last night, making a few very interesting grabs, one of which was a very clutch catch on a short slant route. Naanee could be a very useful slot receiver as well as a wide out, which makes him a dangerous weapon.
Josh Reed, despite issues with his hands last night, will provide quality depth. He has the speed and ability necessary to create separation, and his veteran experience can really help the rest of the receivers.
Despite the fact that Buster Davis was held out, he has played well so far this off season, and the added pressure of it being a contract year for him will force him to play well.
As for the fifth slot, the question mark is officially gone, because it appears that the Chargers are sold on Seyi Ajirotutu, and for good reason. Ajirotutu was the man on the spot last night, and he can easily provide quality relief when the need arises.