Actually, whatever the weakest part of the application is will be the most important part of the application in getting the applicant rejected from the most selective colleges. So if the high school record is the weakest part of the application for this applicant, it will be the most important part. For some other applicant, his/her low test scores may be the most important part; for yet another applicant, his/her less-than-outstanding recommendations may be the most important part, etc…