Yes, the LA Rams fastest players can be deep threat receivers

LA Rams roster need for speed

Let’s draw a line in the sand, and say that speedy receivers are at or nearly a 40-yard dash time of 4.5-seconds. So how do the Rams players stack up?

Name                                    Posn                40-yard dash time
Cooper Kupp                       WR                       4.62-sec
Robert Woods                    WR                       4.51-sec
Van Jefferson                      WR                       4.43-sec
Trishton Jackson                WR                       4.50-sec
J.J. Koski                                WR                       4.54-sec
Nsimba Webster                WR                       4.62-sec
Tyler Higbee                         TE                        N/A
Brycen Hopkins                   TE                        4.66-sec
Cam Akers                            RB                        4.47-sec
Darrell Henderson              RB                        4.49-sec
Xavier Jones                         RB                        4.51-sec
Raymond Calais                  RB                        4.42-sec

Former Players

Josh Reynolds                      WR                       4.52-sec
Brandin Cooks                      WR                       4.33-sec
Todd Gurley                           RB                        4.52-sec

But speed is not the true characteristic of a deep threat receiver. I found a good description on TheSportsGeek.com:

"‘Speed alone doesn’t make a wide receiver a good deep threat, because there’s more involved, including how the defense covers them, ability to get off the line, route running, hands, and height.’-per Rex Hoffman of TheSportsGeek.com"

Another often overlooked characteristic essential to any NFL receiver is quickness. That includes the ability to jump out of the blocks, stop and pivot instantly, and create moves that soon have that receiver yards from a defender. All of those qualities combine to create a potential deep-threat receiver.