User blog comment:Zathronas/Speculative author: What is Cinder's plan?/@comment-16241789-20140803233812/@comment-96.254.157.84-20140803234211

Concerning the second part, it would be impossible for Ozpin not to recognize her if she was one of his former students. I think it's essentially about "keeping friends close and enemies closer".

Maybe he wants Cinder nearby so he can keep and eye on her and maybe convince her to stop her plans before everything spirals out of control. Or he just wants her there so that he can intervene at the proper moment.