Board Thread:Speculation House/@comment-24.212.150.137-20171014022757

It's very likely that Ozpin used the Aura transfer machine before he "died". Even if Cinder was convinced he was dead, he could have snuck into the machine in his dying breaths. His semblance could have come into play, slowing his "death" for a few more desperate seconds.

Even if the machine was intended for use by the Maidens, keep in mind that its main function is to transfer one person's Aura into the body of another. In order for a Maiden's powers to transfer to its next vessel, they must be the last female from the person's recent memory. However, Ozpin is not a Maiden, so this rule doesn't apply. As such, his new vessel would have to have been someone completely random. In the end, Oscar became the lucky vessel.

In theory, of course. 