Ricky should only move down if he wants to fight Cotto (who will be a BEAST at 147)

Ricky has plenty of options at 147, I suggest the winner or Gatti-Baldomir. Gatti has had plenty of wars and his style would bring out the best in Hatton. Baldomir is a good tough fighter but has no power (12 KO's) he does however have a great workrate.

Viv Harris would be a good fighter for Ricky too.

The key is to have a fight so he can get used to the weight, just like anyone else. A rematch would also be smart