[Masenko]

I agree with u, only about the part the Dials should be used.
But Usopp is totally the wrong person on the crew to use them.
He's the Marksman, a sniper, he shoots from faraway, unless he has a way to put it on a boomerang and send it flying at his enemy and then gets it back, it's really wasteful for him to use it, unless on defense, without mentioning that it'd destroy him.
I thought about a way for Luffy to double his damage, by putting the dial somehow on his hand as a fist, meaning on the back of his finger, and then hitting his target with all his power in a fist with a dial on it, causing the enemy to get damaged by: the fist AND the dial's power.