[quote=@Revans Exile]
<Snipped quote by Blue Demon>
Talking about how Inhumans were chosen to go through Terragensis. Cause not all are, and will remain normal like you and I until death.

[/quote]

I believe that it is all by chance. Inhumans are genetically modified humans who breed with 'normal' people and produce more of their kind that way. Just like how people come out with more traits from a parent, an Inhuman would have a 50% chance coming out normal like one of their parents or special like their other parent.