If Manny stops Moseley, it will be quite a feat, Moseley, though getting older, has never been stopped and I don't remember to have seen him seriously hurt neither.
What will play a huge role in that fight is the gas: After the 5th round against Floyd, I felt that Shane was very tired, he got away with it because Floyd's not an agressive fighter and he doesn't throw that many punches but it will be quite different with Manny, especially if he attacks often the body, sucking some extra energy off him.