If what you said was what he was thinking there's no reason for his right hand to be dropped. He didn't try to catch canelo's jab with his glove like the gif you showed in your first post .Canelo feinted to the body
thats not a feint to the body. a feint to the body does not make you reach your right glove out in front of your face. reaching your right glove out in front of your face means that you are trying to parry what you think is a jab to the head. there is no other reason to preform this movement. he is not doing this so he can block a body shot.
for some reason a lot of boxing fans think you cant block a punch to head and a punch to the body at the same time. i dont know where that line of thinking that you have to bring your arm up or down to block one or the other comes from.