Best one two punch at receiver on same team in the history of the NFL?

Charlie Joiner and Kellen Winslow.

While Winslow was a TE in the Air Coryell system he ran receiver routes.

From the "Air Coryell" Wiki page "Former head coach Jon Gruden called Winslow the first "joker" in the NFL. He could line up unpredictably in any formation from a three-point stance as a blocker to a two-point stance or being in motion as a receiver. "