Quote Originally Posted by DarthEnderX View Post
But he already CAN cut Pica. It just doesn't do anything.
He wasn't cutting the right place. Besides, even Pica should be getting tired after all this. Flamingo even made him change the landscape. He wouldn't be human if he wasn't sweating a little now. There's no way reshaping the castle a hundred times wouldn't be harder than swinging a sword 100 times, either. So, Zoro's efforts must have done something, unless this story is really convenient for the bad guys, yet they would still lose despite of it.

It seems to me of Straw hats the parasite string might work on Usopp - if Usopp was alone, that is. Maybe even Robin, but Robin is a master of keeping herself hidden due to her past. The rest would see/feel it coming, and in Franky's cyborg case it might not even work. His skin stops bullets. It should stop a string as well.