At my D’s school, most students apply EA as there is no reason not to. Those got deferred do have weaker stat and some of them got admitted in the RD round. That is totally expected. Only a very small portion of students did not apply EA but RD only. Note the Naviance data is not for the latest year. The admission stat has changed significantly in the recent years. Just look at the drop in admission rate even for instate students. It was over 50% a couple year ago and it is 44% last year.