Board Thread:Speculation House/@comment-11188061-20131022161224/@comment-11188061-20131023174457

Crimson in my opinion is not the Mother Grimm at the very least, because she seemed to be using Aura when dueling Glynda Goodwitch. That implied that she has a soul still.

I did wonder more than once that Adam may be something more than just a faunu hiding his face. He may be a Grimm-Man, though I believe that he still has a soul yet. His Aura skill 'Seeing Red' is a proof to that.

However, as mentioned by Monty Oum before, his technique is completely different from Ruby's. In the Black Trailer, Blake had inquired whether Adam was sure he wanted to use the technique. This implied there's a certain amount of risk or harm to Adam everytime he uses 'Seeing Red'.

Perhaps his Aura technique chips away at his own soul. Therefore every time he uses it, he became closer to a Grimm as he loses his soul bit by bit. Unlike a normal person whose Aura may be exhausted but never be completely emptied, Adam's Aura has a definite limit.