Think at WR right now, Want to pick up Bryant Johnsons out of FA, so who should I drop.?

I would not drop any of your current players for B. Johnson, he has never proven to be a consistant WR. Your worst player is Sammy Morris, and that could change soon, if Maroney doesn't get it together. Your team is loaded, i don't know how you got 2 top 10 picks on your team, but congrats!!