@Overtaker:
I'm thinking the hands that she grew from someone's body will have the strength of that person's strength, I just remember she said to Pell (alabasta guardian, the flying bird) that strength and speed has no meaning against her, if not then her ability would be extremely useless against strong fighter like arlong
I have my doubts here. If the hands would have the persons power then they should actually look like the persons hands, but still Robin always grows her own female hands.
Plus, she doesn´t always grow hands on people but also on lifeless objects where there´s no power to absorb. So I seriously doubt that there´s anything to that theory.
And I don´t think that what she meant with strenght and speed means nothing is not that she´s stronger and faster then the rest but that she has an ability where she doesn´t require it to beat stronger guys then her. I mean think logically, there´s plenty of martial arts techniques where you can cause serious damage to people a lot stronger then yourself. You just need to know how to grab a person and he with all his strenght can´t do anything against it.
And if you think now at Nico Robin, her powers are perfect to take such techniques to the extreme. She can use them to without ever touching the opponents with her real hands. I 100% that´s what her statement meant.