Jhaoata SIlva + Daniel Adams
Not a big lean, but J.Silva has wins on more season fighters who had amateur experience.
J. Silva has a hidden amateur record himself; I also don't see big major gap in skill vs Igor Da Silva
They have the same strengths and style; I'm siding with a more slightly better resume.
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Daniel Adams is a good wrestler with college credentials and an aka trained fighter, not a major lean, but he's had dominating performances. Jacobi has one loss against a grappler. He's got the better resume on record but not like he's a world beater.
Jacobi has been controlled in the past. He can be grounded.
Igor and Jhonata are both solid, but think it's worth pointing out that Igor's only 20 years old, and has so far managed to finish every opponent against some decent & experienced competition. Pretty impressive for a young flyweight, and you have to imagine that he's only going to improve. Jhonata's also only had 1 fight in 4 years. Don't think he's an awful choice as a moderate underdog, but I think Igor's rightfully the favorite.
Daniel Allen might have a decent background, but his quality of competition is a big red flag to me. Only fought 4 cans when he should already be mid-career. I'd be hesitant to call Jones a world beater himself, but he's been the more active guy beating better competition. Also has a college wrestling background + decent grappling despite the submission loss to an armbar specialist.