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Ironclad This chapter has stated that there is a difference of talent between two individuals at the same level.
They don't gain the same amount of stats, which mean that someone that has a low level, but a high talent, might be stronger than someone with a high level, but a low talent.
Basically, being lv99 just means that you cannot improve anymore.
So if you're still weak at that point, then you're just a worthless individual.
Wasabi probably has an incredibly high talent.
Or it's just that, since goblins are supposed to die at low level, they gain a biig amount of stats at each level up as a reward.