I believe Thurman can be built as a real star and marketed if he can keep his end of the bargain and sustain it, fight good fighters and keep winning.
GGG and Kovalev are already kings of their division within the sport but i'd say the only people that will ever know about them already know about them. They're not really going to be crossover stars, however GGG is closer to being one than Kovalev. Many people know about him and like to watch his fights but he's approaching mid 30's and might only have a few years left at the top.
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