The charting outcomes have a stat point that is percentage of matched applicants from top 40 NIH funded med schools by specialty. If memory serves, the numbers aren't overwhelmingly high. And considering top schools have many top applicants, I think what you've been told is true. It would be easier from a top school, but done from anywhere. For me, personally, I wasn't going to make it an excuse if I didn't get into a top school, but I don't think working any less for it from a top school is a good idea either.