If Hatton fights and beats the smaller Pacman does he really get the recognition he seeks? I don't believe he retires after two more fights anyway, he is not yet 30 and still to much money in it for him to give it away just yet.
Do what Tszyu did and unify the title at 140lb, you can only beat who they put in front of you and if that includes Pacquaio then his legacy is assured.