Why would we trade him for a 4th when we could get a 3rd when he leaves after next season anyways?
I wouldn't trade him for anything less than a #2. Let him come in late and then wear his a$$ out and have him run a whole lot of routes across the middle. I would put as much wear on those tires as we can and then let him go out and try to sell that. IMO it will also expose that he isn't the WR he has been made out to be just as JD Steeler said and his price will come down significantly.
Playing Fantasy Football does not qualify you to be the in the front office or on the coaching staff of the Pittsburgh Steelers. They are professionals and you are not!