Board Thread:Speculation House/@comment-25266931-20161228024928/@comment-4010415-20161228155250

Terminus99 wrote: I'm not so sure about the theory that Cinder is part Grimm because of the glove. It looked to me like the glove simply dissapeared. I don't think that it was absorbed by Cinder.

Of course, we know that there is something in Cinder's body now, that Salem is using to treat her, but I doubt that it is the Grimm that she used to steal Amber's powers. Then, why did Ruby's silver eye flash affect Cinder, when we were only told about it affecting Grimm? Salem said that Cinder's attainment of the Fall Maiden powers is what led to her having a weakness to silver eyes. How did Cinder attain the Fall Maiden powers? A glove with a Grimm beetle in it. Said glove disappeared, and then her tattoo appeared on her back in a similar way to how the glove disappeared.

So far, that seems like the best bet/assumption.