I dunno, Datsuki was so eager of provocing Ryuuko and then straight out telling her the next step. She definitly want Ryuuko to interfere. Maybe she want her to be faster then her, crush the schools resistance and then collecting the weakend schools easier.Yeah, but Ryuuko's motivation in the next episodes should be to specifically thwart Satsuki's plans. It would be dumb for them to pull the "I planned on you defeating my army" card again.