Okay, I have a couple of therioes. Most of them sound stupid , or probably have been said. But, here goes:
1st. The Kahoni Nuva are chaning back to grey, and so are their bodies (I think.), so maybe when they loose their elemental powers, they loose their color. Okay, so this is known, but maybe the elemental powers that they were given colored them, and when the lost them, they are being "erased" and may never be able to get the powers again. Just a thought. Bad one, I know.
2nd. The Silver Krana Kal doesn't exist. It's way to powerful. How could you stop a Bohrok Kal with it?
3rd. The Bahrag were the original inhabitants, and so where the Bohrok. The Bahrag then made the Krana so that they could recieve information from the Bohrok, while the Bohrok needed their will power.
4th. The 2004-2005 storyline will tell us more about the Matoran and the Turga (That is what Greg said), so maybe we will finally find out the origins of life.
I know that most of them have been said, or something. Tell me what you think. Any comments accepted. No flaming or spamming though.