"It's pretty tough, but it's what they needed," Master Kesi said.
"The board has sent a report saying they are pleased with what happened there.
"It should have happened a long time ago ... now the seniors are asking when they can have theirs."
Kesi rated Jacobs as the most likely of the three Tauranga fighters to claim a medal, but he, too, will have his work cut out in the under-78kg division against a legion of lean, long fighters.
"They are like birds with long beaks that you can't get near.
"A lot of the fighters from overseas look more like nerds, but when you get in the ring it's another kettle of fish. Honestly, I've seen them.
"They come with their glasses - no offence - then next minute a friend will tell me to watch the same boy. Then it's like, bang bang.
"It's like they have hands on their feet. And the look on the face has changed - it looks like they want to kill you. They have the mentality they want to win. If they get a medal they can get a lot of money."
Kesi knows a medal from any of the New Zealand contingent could make the world of difference for the sport.
"The way I see it in Oceania there are 20-odd countries. We are on the ground level. We have to travel far for good training.
"If we can get someone to place at a world champs we have done our job properly. The sports organisation would then look at it more closely.
"The funding is quite hard. Someone has to break it through.
"It's about going out there and saying I'm from New Zealand and this is what I can do."