Pretty good summarization.
How do you think the masks became hidden?
Oh! And here’s a thought.
What if the Toa Masks are just the Mask of ultimate power, separated.
As in, when Ekimu Whacked his hammer at Makuta, it shattered the masks into six different areas of the island.
The only problem with this type of idea, is the fact that the mask of ultimate power seems to look a lot like the Golden Skull Spider.