I disagree with your premise one hundred percent.
The contents of the egg will be what it will be regardless of whether or not we observe it. If it will be another chicken, it will be another chicken. If it will be the next species by some definition, that's what it'll be. But this is not determined when it hatches. That's not how it works. It's determined when the embryo is formed, way before hatching.
So this premise of observing and so on is not something I can keep discussing, I feel. It's not relevant to the matter, because whatever comes out comes out regardless of our presence.
Feel me?