I think what kills me the most is that the Adults were probably researching this their entire lives. Like “Where did the meteor come from?” “Why is there a baby in here” “Who is responsible for this”

and after they are done investigation John comes up behind them and is the cause of everything without them realizing

ugh my head….

SO

To avoid paradoxes you can’t have just 1 person, otherwise it will be an exact copy of said person

So by having at least 4 genetic samples the machine (whatever the hell it is) can mix and match safely to create new genetic variations of said people

thus creating the 4 of them

So are they all technically siblings, or what?