Be fruitful and multiply?

Does the number of yeast cells increase as the fermentation progresses? Do the billion cells at the pitch become two billion on bottling day?

Would I need two each S-05 or S-04 packets for eight, nine or ten pounds of liquid malt?

Yes, the number of yeast cells increases up to a point, then levels off. Your questions can be answered by reading this:

https://howtobrew.com/section-1/chapter-6/

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Maybe. It depends on the OG of the beer. Just because yeast multiplies doesn’t mean you don’t need to pitch an adequate amount to begin with. If it worked like that, you could pitch a single cell.

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If it was an Arnold Schwartencell in its prime…

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Wow, the insights on yeast propagation are fascinating!

Yes, the number of yeast cells increases up to a point, then levels off. Your questions can be answered by reading this:

https://howtobrew.com/section-1/chapter-6/ blocky blast

Thank you so much