Sean Payton continues to add to his first Broncos coaching staff with more experience and also more youth. Payton is hiring longtime Saints linebackers coach Joe Vitt as a senior defensive assistant and LSU assistant Jamar Cain as a pass-rush coaching specialist in Denver, sources confirmed to The Post on Saturday. Vitt was the linebackers coach in New Orleans from 2006-16 and served as the Saints’ interim head coach for the second part of the 2012 season when Payton was suspended for the entire year because of the Bounty Gate scandal.