While we know there are three main races of Matoran(or stages of evolution), the Matoran, the Toa, and then the Turaga. It follows a pattern that cannot be reverted(or we never heard from Toa becoming Matoran again). But what if there are other possible evolutions that are possible through new technologies?
I had one in mind that affects the Matoran. It is a category between Matoran and Toa, called the Xanatoran. The destruction of the Red Star would lead to a big energy leak, which would then affect every Matoran. The failsafe we had in 2006 transformed the Matoran Jaller, Hahli, Hewkii, Matoro, Kongu and Nuparu into the Toa Inika. The energy that has been released would affect every Matoran, but due the energy being absorbed by many Matoran, they become only stronger, taller, and have limited access to their elemental powers, instead of becoming a real Toa.
This is just my theory, it's highly unlikely that the release of such energy on an entire planet would affect all Matoran.
So what ideas do you have for another race/stage of evolution for the Matoran race? Or do you prefer the way they are?