What if Vulcan had not stopped Black Bolt from exploding the terrigan bomb?
Something along the lines where everyone everywhere becomes inhumans and for a period there is a time of piece but peoples natural differences cause another war on the Kree/Skrull scale.
To try to stop the war that the Inhumans caused reed creates another bomb with the opposite effects as the terrigan bomb.This not only revereses the effects but it also turns all the inhumans into humans.
The Inhumans are cured and lead the Kree empire into a time of peace.