Board Thread:General Discussion/@comment-25394244-20141209031147/@comment-25394244-20150310020945

The whole thing with two arms:

So far fusions have only happened with Amethyst in them (besides Stevonnie). Maybe this has something to do with it. Sugilite has more eyes. This could be a Garnet thing. Pearl, I don't know what her thing is.

If adding arms IS a Amethyst thing, then this would complete the Garnet theory.