I could be wrong, but I don't think the early-applicant advantage is based on how "bad" the adcoms think of the complete date--- I think its based on how many people were reviewed ahead of us, and subsequently how many interview spots are left. I believe the lag was caused by more people submitting early.
This cycle being 2-3 weeks behind previous ones means that we won't know how it affects our admissions chances until its over. I know that's hard to sit with (and believe me, I've wasted my time on the Internet trying to get nonexistent answers too), but worrying about data we don't have will only distract us from the secondaries we can still write!!
Unexpected situation, stressful time, but we can only control what we have left. Good luck!!