Spoiler Theory: Sin, used his fruit to stop Robin's heart, "killing" her, and "revived" her again using his lighting like a defibrillator, that made her lose her previous DF, and that's why Sin doesn't like talking about it, since he had to "Kill" his precious sister in order to changer her DF. Am I right author?

Do it, just do it!

Name?

Disciple is good. But if u want to change It's okay too

Yes sir