In terms of experience, Gesta can really dominate this undefeated boxer Tanajara, but for me experience is not the only factor that can make a boxer dominate his opponent. Tanajara is much younger and I believe that he is quicker than Gesta. But in terms of potential, i'm with this Filipino boxer, I'm not amazed with Tanajara's record.
It could also the height and the reach, Gesta has all that advantage.
As per OP's post.
height
Gesta is 5'10" vs Tanajara 5'7"
Reach
Gesta is 75cm" vs Tanajara 68cm.
You got it wrong, it's the other way around, Tanajara is taller and young and the reach advantage.
So Gesta is at a disadvantage here, that's why he is the underdog in this fight. But as you can see, you can't underestimate a boxer specially Filipinos even though the odds are against them. And even if their opponents are taller, they will find a way to win with their big heart.