The momentum of the fight, is based solely on how well Brook reacts to the first big punch he takes, if he's able to withstand than he's likely to go in the later rounds, he wobbles, it may be an early night. I'm really anxious to see how he looks for the weight in.
Brook is gonna get the typical mercy UK stoppage & GEE's/HBO's TKO streak will continue so they can keep marketing this guy.
Golovkin is very good at avoiding holds and clinches. He does this by stepping back slightly and he has a hand near his body at all times that he can use to push off once an opponent tries to hold. Because of this and the way Golovkin cuts the ring, Brook will not be able to extend the fight. KO/TKO within 6.
He also creates a barrier with his head, creating a gap between him and his opponent so they have to reach further to try and clinch him and then he pushes his head into their throats from a low position to raise his opponents head giving him a stronger base to push his opponent off of him. We saw him use it in the recent Wade fight. Stopping an opponent clinching really isn't that hard, you just create that barrier, some like Golovkin use their head, Mayweather used his forearm, Toney used his shoulder, but most fighters don't have the knowledge or skill to do it.
Brook would be lucky to get past 6 rounds.. GGG will carry in for 2 rounds at least because it's Brook's capital city London.. From the 3Rd Round GGG will be given green light..
If GGG is ill, Kell within 3 rounds. He must jump on GGG from the opening bell. Other than that, GGG within 5. I can't see this fight lasting much longer than 15 minutes.