As much as I'd love to dump CJ and replace him with a Richardson/Forte combo, Welker is just TOO valuable. 7 TDs in 5 games man (leading the league). The hit your WR group would take outweighs the boost your RB group would receive IMHO. Honestly, I think you'll regret it if you make this trade. You say you're in first place and have the most points in the league. Well, looking at your roster Wes Welker is probably the biggest reason that is the case. He's the MVP of your team. You have a lot of decent-to-solid WRs. But you're still going to miss Welker big time if you trade him. If I were you I'd instead try to package Colston and CJ for ONE new RB.