Agree to that comment!
If you have a totally different set of activities listed in your resume versus your essays, then you will begin to lose credibility.
Most essays will require you to write your best professional/personal stories, where you made an impact. A resume is a snapshot of all the activities where you made impact -in your professional as well as personal life. So, you can see the overlap between these two things.
Essentially what the essays do is give the story behind the bullet point in the resume. The resume pointers address "what you did", but the essays also tell "how you did it" in addition to the "what".
Hope that helps.
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