Darnell Boone - Boxer

Darnell Boone: “I can beat any of the top ten ranked fighters” - Doghouse Boxing News Report

He dropped Andre Ward.

He stopped Adonis Stevenson. (Who recently rematched and TKO'd him)

He lost a split decision to Sergey Kovalev (who later rematched n TKO'd him)

What is it about this 19-21 fighter that has caused rising stars and future champions so many problems?