I have a theory.
What if the Xel'Naga are going to be antagonists? It said multiple time that they werent necessarily, but they could be.
My theory is that the energy beings are going to absorb key parts of the protoss and zerg, and then assimilate and destroy them completely.
It says that the Xel'Naga always chooses two species to adapt, but we have never seen these species in the starcraft universe ever. I think that the Xel'Naga consume both species. Or would, unless the protoss and zerg do something about it.
Duran and Ulrezaj could have forseen this, and are creating the hybrids not to fight the protoss with, but to attack the Xel'Naga.
*Edit*
Also, just a thought, what if the terrans themselves were previously engineered by the Xel'Naga, but don't have the means of remembrance or ways to find out that it happened.




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The last one (not counting hybrids, which may be seen as an incarnation) were almost wiped out, and it's a bit doubtful that any are alive nowadays (unless a bunch froze themselves).



