Most of the surviving electrons and positrons annihilated each other, releasing gamma radiation that briefly reheated the universe. So as we know Quark-Gluon Plasma was created during the Reheating Phase (which means quarks were formed during reheating phase). That means electrons were existing before Reheating. Which proves electrons existed before quarks. But I tried searching on the internet and I could find out that both leptons and quarks came into existence at the same time. Did electrons form before quarks?