I think Lee has more roadblocks at 57 KG than 65 KG.
Zain has one true roadblock, providing he doesn't get a beast off the scale, he will be fine. He will only have to weigh in once if he makes the finals (I don't think they wrestle the finals).
Lee on the other hand has a net tonne of landmines he will have to navigate. Luckily I don't think he cuts much (any) weight to make 57 KG, so he won't have to worry off the scale like Gilman would have. I also think his skill advantage against everyone in the field will be evident early in matches. I just hope he can put them away and not trust his tank. Tilts should work better for points against the international folks, so we'll see.
I am more confident in Retherford due to him being the 2nd best in the field, at worst. Lee might be the best, but he has many more landmines to navigate.