It would be great to bring egg zavier back this moment because:
1)So many ppl who complain that AL became pay to win will understand that there werent totally right
2)In my opinion most prices of eggs have came back to normal prices (or even a little bit overpriced that they should be)
3)Will help arlorers to unlock pet achievements
4)Poor players who cant merch due to current conditions and so they cant make any money will grab this amazing chance to make gold by farming/merching those eggs.

The only drawback from my view is that prices (of eggs) will fall BUT this can gradually be solved as it was at first point

I know that there will be those kind of ppl who will become nervous cuz they have spent millions and millions to get some pets.To avoid this maybe a measure would be to exlude some pets from this "event" (in case it happens)