Not to get too pedantic about it, but if the question is did anyone get in with a score below the 25th percentile, by definition the answer is yes, 25% of the pool did. Obviously the vast majority of those are hooked. Sometimes something shines through an unhooked applicant, but it’s not always obvious what that might be, and as already alluded to it’s likely to be the package deal - essays, recs, ECs etc. My daughter managed this last year (admission at the 25th percentile ACT of 30, unhooked) but right at the bottom end of the T30, so not as competitive as what you seem to be looking at.