I think you are just as qualified as many of the other highly qualified applicants who were accepted, rejected and waitlisted. Your legacy status probably gave you a tip into the accepted pile. I’m sorry if that’s not what you want to hear but there just isn’t anyone who can say of course you would be accepted without it. Many who have your same stats were not accepted and many were accepted without your legacy status, so who knows. Just go and enjoy yourself and let it go!