Golovkin is another one of those few guys that only rehydrates a few pounds, usually he's right around 164-165. Thats why I hope he doesn't go up to 168. I can see Andre Ward trying to lure him up and knowing Golovkin he'll take it (he challenged Hopkins at 175 for crying out loud!).
Anyways, Macklin is a very tough opponent he beat Felix Sturms ass but was blatantly robbed in Germany. He gave Martinez a tough ass fight as well , I expect him to give ggg a fight, there will be a lot of big shots by both guys Macklin always brings it.