Metcalf made it to Worlds in 2010 the year they were in Moscow. He lost to Tushishvili in the first round. He won the Olympic test event last year, that's probably what you're thinking of. He beat Hasanov this year's bronze medalist from Azerbaijan in the final.
As far as the thread topic I agree at 60, 66, 74, and 96. I think it would be interesting to speculate on who fills the other three spots.
As far as 84 kilos as one of the spots being up in the air, if he decides he wants it I certainly wouldn't bet against Ed Ruth.