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Jake and Jayce were brothers who were chosen to be in the ranks of Supernovas not because of their individual battle prowess but it was due of their mechanical knowledge and their ability to utilize their gadgets.
The Sun-Moon Continent was a country that focused on its technological department. And because of this, the said continent became the most advanced country when it came to their technology.
Using this advantage, they tried to be ahead of their competitors. But the other countries also had their respective specialties.
Just like the Soaring Continent for example; a country known for having the strongest military prowess in the whole world.
Or like the Lost Soul Continent that was known to have the greatest assassins of the world.
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While advancing forward, Jake and Jayce immediately took out their weapons as they didn't want to underestimate their opponent after seeing what happened to the two Decastars earlier.