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It's possible that the egg and facehugger are the same organism, and it's simply shedding an outer layer: Layer 1 = egg, layer 2 =facehugger, final layer is actual embryo. So the Queen lays a fully functional embryo, complete with its own delivery system.
Oooo... I find this theory very compelling. Also, I cannot be objective about this because I am highly invested in seeing xenomorphs secure DP status.
