Should I submit an extra letter of rec- Yale

Looking at Yale’s page about letters of rec, they “do not encourage” additional letters of rec. The letter of rec I’m considering submitting is from the surgeon I’ve shadowed all summer, who used to serve on one of the Yale boards run by alumni. Is it worth sending in his input, or should I skip it considering Yale’s wording?

If you haven’t gone through this page, you should. Watch the video.

Unless this third writer can point to examples of substantive contributions that you made, the third letter will not help you.