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The trick is that Boaster knows how to and practices fights and clutches while FNS has deluded himself into thinking he doesn't need to practice and it's acceptable to try and run away from every fight if his teammates can make up for it (spoiler alert: they can't).
There's such an obvious difference in playstyle and mindset between Boaster's confident Astra/Omen and FNS visibly panicking shitting himself as KJ on Pearl realising he's 100% about to throw what for literally any other player in the league would be a round winning lurk on one of the most important rounds of the entire Bo3.