i think its welker at WR, i mean wedont think about it now, but before preseason stared when we were all making our "mock rosters" if we even had him on the roster at wideout it was at the 6th maybe even 7th spot, he played a great preseason and we all were shocked by it and now hes our 3rd reciever and is still making progress, i mean this is a guy we had and knew we had a goo kick returner in, but no one woudl ever think he would make it this far in the nfl as a reciever..i love the guy
EDIT:there are also some other very close canidates