Have any of these versions been officially confirmed?
In this case, everyone has to put together their own theory.
Personally, I like the version with the fruit liquid best.
If Bishop brought the egg aboard the Sulaco, he probably wouldn't have stuck it to the mesh floor but would have used another hiding place.
The other Hugger or Huggers may have been in the dropship when it was still on the planet.
In the case of A3 AC, I think it is also difficult to explain where the QueenHugger comes from.
In any case, the hugger on the Sulaco doesn't have webbed feet.