Hatton didn't have the skills to land any meaningful bodyshots. Cotto was able to make emmanuel back up for a few seconds with some of those bodyshots he landed. We know what happened with marg. His body is an important target. People have hurt him better with bodyshots than headshots. Plus he uses a lot of leg movement in his fights and a style that takes up lots of stamina, bodyshots weaken those things.
Body shots are important against whoever you are trying to beat.. and especially on guys who you really need to slow down. You were trying to imply that his body is weak, which is hilarious... based on the shots he has taken to the body, and recovered from them so quickly