Luffy's lightning spear could perhaps be one of the most broken weapons in OP
lightning moves at light speed, however if Luffy uses awakening on it and makes it elastic, then it would essentially be a solid object. However with G4, we've seen how Luffy can manipulate his elasticity to create immense power or stretch extreme distances.
If luffy applies this same control of elasticity to the lightning, he would essentially have a sun wukong-like staff that can stretch at near light speed. And unlike normal lightning, this wouldn't just shock kaido, it would do blunt damage as a result of it being solidified. Coupled with CoA and CoC, this would be like getting punched at light speed.
However, unlike kizaru's lasers or linlin's fulgora, this would have no charge up time. All luffy needs to do is loosen the elasticity around his lightning and it would fire off like lightning usually does.
Imo, this ability is going to make G4 look like a meme. Kaido's going to get his ass handed to him in 1047 until he uses awakening.