As far as I know N'Jikam is probably the most far along and proven. He has a KO win over a then top 10 guy on some organizations lists in Gennady Martirosyan. Although his level of competition dropped off for some reason after that.
He should be getting a title shot soon possibly from the WBA if Golovkin goes after the WBC belt whom he's the #1 ranked for.
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