Theory about destiny
Destiny is a funny thing in BIONICLE. It’s supposed to be some sort of immutable outcome that can influence a person’s life in certain ways, like whether or not a Toa stone will transform somebody, or how energized protodermis will change you.
Some, particularly on BZPower, simply describe it as a function of the Great Spirit. A sort of universe-wide sorting algorithm (I like the sound of that, The Destiny Algorithm) to decide which Matoran should be enhanced into Toa, and such. This does make sense, to a certain degree, and I bought into this until theory until I started thinking about it in a little more detail. Then I realized that Energized Protodermis busted this myth.