Board Thread:General Discussion/@comment-25926288-20151203163126/@comment-24674051-20151203173650

Interesting thought. however, Merlin has already commented that the path Emma is on (at least back in Camelot) was the darkest of the possible paths that he had forseen. and I think Hook is on an even darker path.

But as to why, I highly suspect that Killian isn't showing signs because Emma glamored him. That was never shown on screen, but it is what is in my headcanon. We saw Killian as normal before killing Merlin, and the only mistake would be to not show him as changed at the point he crushed the heart and cast the Curse. When Emma took his memories, the smart thing would be to also glamour him so that he can't see himself (and others can't see him) as he truly is.

Of course, Killian is also a little bit self-absorbed and probably would not like the scaly look, any more than he liked the monk-style robes. Particularly if the scaly look continually reminded him of "the Crocodile". And he has shown capacity to control his look.

I'll overlook the mistake, since they may not have wanted to spend however long in makeup just to do that one scene.

Emma does show some signs of the glittery skin, plus the change in hair color. We saw a little hint of the glitter on her hand in "The Price". Also, Emma's light side may be helping to control some of the aspects of Darkness, as we know that she is still clearly the Savior and the strongest light magician remaining, even being the Dark One.