Also eggs are developed PRETTY DAMN QUICKLY, like even birds aside from  chickens and ducks. So Wilson would very literally wake up in the morning and be like HUH, THAT’S WEIRD at his tum. Probably only a few more days and it’d be laid.

Also Maxwell is far broodier than Wilson and is rather overtly protective of the egg. Well, that is once they determine that it is indeed fertilized with the light trick after a week. Family is a sensitive subject for him.