Apples to oranges. Loma did next to nothing for most of the fight against Lopez. Loma did not even attempt to win rounds until it was too late. Canelo GGG 1 was closely contested throughout, which is why it was difficult for the judges to score.
In retrospect, they didn't need to rob GGG twice for Canelo to be great, but how were they to know? They needed to steal the victory while they could.