I've heard a lot about the Bohrok Kal having "secondary powers." One including gravity. I am convinced that the Kohrok Kal are the ones with the gravity power. Example. When the ice dude protecting Kopaka's Nuva symbol was attacked by a Kohrok he said he was "soo heavy, can't move."
If anyone else knows anything else about these "secondary" powers or have comments please post.
P.S. If this has already been done pleas tell me.