#2 Travis Browne
Travis Browne's career took a turn for the worse after getting knocked out by his friend and former training partner Andrei Arlovski back in 2015. 'Hapa' has gone 1-4 after the Arlovski fight, with his performances looking increasingly worse as time goes by.
The towering Hawaiian fighter is on a 4-fight losing streak and has been struggling to get back in the win column. However, the 6'7" KO artist has always been regarded as a naturally talented combatant, and could likely turn things around if he moves to ONE Championship.
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This isn't a meant to be a knock on ONE Championship, but rather praise for the UFC -- in the sense that, often times, fighters need to step away from the UFC's famed Octagon and rebuild their careers elsewhere, before returning to the UFC. Browne could easily restructure his striking game, whilst also adding better wrestling fundamentals to his arsenal in ONE Championship.