None of their abilities are as good as the originals. Kid Mihawk, for instance, can't cut as well as Mihawk. He can't shoot lasers as great as Kizaru. So we don't have any reasons to believe their defense would be as good as a Lunarian in the first place.
Swordsmanship is dependant on experience and training. They dont have Mihawk's training.
Lazers are dependant on the actual DF and seeing how far you can go with it.
In both these cases Vegapunk didnt have Mihawk's sword training and experience. Nor did he ever replicate the Pika Fruit like he did Kaido's fruit. And we know how perfect Momo's fruit is. It was good enough to manipulate Kaido's own flame clouds.
Vegapunk stole King's genes and DNA. Thats more than enough for full on Lunarian Defence because thats where King got it from. If Lunarian defence was based on a DF or Training...sure yall would have a point. But it doesnt....its based on genetics.
Lazers are dependant on the actual DF and seeing how far you can go with it.
In both these cases Vegapunk didnt have Mihawk's sword training and experience. Nor did he ever replicate the Pika Fruit like he did Kaido's fruit. And we know how perfect Momo's fruit is. It was good enough to manipulate Kaido's own flame clouds.
Vegapunk stole King's genes and DNA. Thats more than enough for full on Lunarian Defence because thats where King got it from. If Lunarian defence was based on a DF or Training...sure yall would have a point. But it doesnt....its based on genetics.