Perhaps most important to this discussion is that Harvard, Princeton, and Yale have need-blind admissions policies. Questbridge Finalist status had nothing to do with the student being admitted. The only advantage QB conferred was, in some cases, a streamlined application process and, presumably, application fee waivers. SAT/ACT/SAT II scores and high school transcripts, teacher recommendations, and essays were required.
The QB partner schools that my son applied to required two years of tax returns, the associated W-2s, and a completed CSS Profile for FA consideration.