As the firstborns in God's arrangement had certain privileges (dare I say authority, haha), so would Adam have had, being the firstborn in the family.
Njengoba amazibulo elungiselelweni likaNkulunkulu ayenamalungelo athile (angisho ngesibindi ukuthi igunya, haha), no-Adamu wayezoba nalo, ekubeni izibulo emndenini.