Think Golovkin batters AA to the body to the point that AA isnt there in the late rounds or hasnt got the stamina to launch an attack capable of taking GGG out. AA hates being hit to the body, GGG was bending Proksa double with his shots to the mid section.
Golovkin UD he would pound Abraham's body to where Abraham hardly throws late in the fight but i dont think he can stop him