from an evolutionary 'historic' perspective the 'egg' (and sperm) preceded the cellular aggregates

Really? 'egg' and 'sperm' are rather specialized cell types, thus part of a 'cellular aggregate'...

So it seems to me that your exposition of evolution history is yet another shift of viewpoint (as dino/egg, turtle/egg, fish/egg, ...) containing the same problem:

Egg+Sperm<->Multicellular_Organisms
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To solve the chicken/egg puzzle we first have to put both terms on the same level. "Chicken" is a specialized term, "Egg" is general, so establishing "firstness" of chicken and egg is like comparing apple and fruit.

So, let's just talk about 'chicken' and 'chicken egg'. There's the reasoning that the first chicken egg was laid by a creature which itself was not a chicken. Later, a chicken hatched from that egg.

But until the chicken hatched, the egg was not a chicken egg, but an ordinary non-chicken egg. The non-chicken egg became a chicken egg at the moment the chicken hatched from it, not before. If it already had been a chicken egg, because it contained a chicken, then the egg was formed as a container of the chicken, and the chicken was formed as content of it's chicken egg.

They both came into existence at the moment the chickenness of the chicken-egg's chicken and the chicken-eggness of the chicken's chicken-egg could clearly be established beyond doubt.

That's why chicken and egg are one, and there's no "first" in chicken nor egg...

Name them, and they are. In principio erat verbum.

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