Yeah. I just mean if Sakura was willing to use a Command Spell then Rider would probably see she is serious about it and would probably listen. Even if she did not actually use the CS. Also, wouldn't the book basically be the same thing? Even if Shinji has the book it is not like it can make Rider obey his every command, so she would still have to be willing to work with him. Or is it like, a constant Command Spell or something.