Grey

The perfect creation
Unlike the two that came before them, they would do everything right
Follow the will of their creator absoutely
To allow the world they came from to bear fruit
Fruit that was not rotten to the core like the other two
But despite them being perfect
Everything their creator could ever want in an originator
They never would attain that goal
For to gain the power to create a new world, one must truly desire to do so
And that desire for a new world was that of their creator, not their own
They were merely a vessel, nothing more
And so despite doing everything right
Despite doing exactly as their creator had wished for them to do
They were a failure, and were discarded like any other.