Good summary of the WRs.
Imo Rams also need more speed and/or quickness. Someone with dynamic ability to get open. Stretch the field, in any direction, open the field more for Kupp. Help create explosives, as McVay always used to talk about. Not just Kupp and a possession game (such as AR might have offered had they thrown him the ball.)
Maybe Jefferson has it, but haven't seen it reflected in production on the field or downfield catches. May have good top speed but doesn't seem to have great quickness or great routes. 1/2 as you say. Glass half empty. Atwell has great speed, but not sure about his cutting ability. Rams also haven't made much use of him so far, and not clear he can be an every down receiver with a full route tree.
After trading Cooks, Rams have tried to get more speed/ explosiveness back with DJax, Atwell and OBJ. It worked with OBJ, who probably wasn't a sprinter by the time he was with the Rams but had great cutting ability, could always get open and was a threat anywhere on the field.
Who in the draft can help bring this dynamic element at WR back for the Rams?