User blog comment:Powerhouse411/Who Are Your Choices of Shichibukai?/@comment-3507136-20140206215728/@comment-4080028-20140207004422

Well, I'm flattered you'd consider Sakura, but I doubt she'd agree to the invitation. As I explained below, Sakura dislikes the government (something I'm still trying to properly explain in her backstory, when I get around to it.) In fact, she detests her uncle and feels he's shamed swordsmen worldwide by allowing his skills to be put to use for the sake of the government and Marines. In Sakura's eyes, it's as if her very role model has willingly abandoned all his dignity simply to join the winning side. To put it simply, it irks her. It irks her real bad.

Although I do admit, I almost did the same thing. I was thinking to myself last night "well, I have a Dracule, and if Mihawk's gone, I could have Sakura fill in the role." And then of course, I remembered the important fact that Sakura won't allow her sense of honor and self-worth to be diminished by working for her enemies. Like with Lucius, it's a pride thing.