in general when you cut down that much you don't gain speed... I think that canelo really hasn't lost much fat or muscle, he is just gonna be drained more. He can tell himself that the 152 is an advantage to keep him psychologically on his game. But in the end its definitely a disadvantage.
What do you expect him to say 'Yeah. Im gonna be weight drained and puffing more than usual. But hey, gotta get paid.'