Half of Eric Metcalf's NFL-record 10 career punt-return TDs came under O'Brien's watch in Cleveland, and in his first season in Denver, O'Brien coaxed the Broncos to their first punt-return score in four years.
That could be good news for the Patriots, who haven't had a punt returned for a touchdown since 2001.
However, O'Brien's teams struggled on coverage in Denver. In 2007, his team was 26th in punt coverage and 19th in kickoff coverage, allowing two punt-return touchdowns and one kickoff TD. Last season, Denver ranked 28th in both categories and gave up both a punt-return and kickoff-return touchdown.