So, I've been wondering some things about Kanoka and Kanohi, mainly dealing with their creation.
According to the Bionicle Wiki "Kanoka Disks were crafted from purified Protodermis forged in a mold. Each Kanoka was stamped with the symbol of the Metru in which it was made, and was engraved with a three-digit "Kanoka Code" that described its strength and special power."
and Kanohi are made from different combinations of Kanoka Disks.
The main problem I'm seeing here is that it is never really definitively stated where Kanoka and Kanohi get their power, all we know is that they are molded from purified Protodermis. My main theory here is that when they are molded, some other element is introduced that bonds with the Protodermis giving it it's power, and that the purity of the Protodermis affects the strength of the bond, and thus the strength of the disk. This also explains where mask powers, being that the various elements of those different disks would combine resulting in that power. This theory also explains why we never saw Kanoka or Kanohi being made on Mata Nui, the Matoran didn't have the technology necessary to purify the protodermis enough to make the bond...
Anyways, this is my attempt at coming up with a theory on the exact mechanics of how Kanoka and Kanohi are made, what do you think?