Honestly I don't think this boxer will become a threat for Garcia, Gesta haven't fight any champion yet. He mostly lost when fight against good boxer and few times he win with a close decision either majority or split. If there's a bookie will add this match, I wouldn't surprised if the moneyline odds for Garcia is lower than 1.15x. Gesta haven't lost via KO even though there's few match if he's fell down, so it's will be interesting if Garcia can win via KO.
Mercito Gesta lost once via KO against Juan Antonio Rodriguez last March of 2019, it was an intense bloody fight, but the Mexican boxer was the one who prevailed on that specific fight.
Back to this fight, I'm not really expecting that much either knowing that Mercito Gesta is just there to keep Ryan Garcia in shape as this is just a mere tune-up fight. And as usual, Garcia got the size advantage as well as the reach compared to the Filipino boxer. Although, Garcia should still be careful and not lower his guard at the crucial times because the experience always speaks the most and Mercito got those advantage.