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Not much is expected to change under Helfrich, who is himself following Kelly’s “Next Man In” philosophy.

As offensive coordinator, Helfrich has been in charge of Oregon’s quarterbacks, guiding both Darron Thomas and redshirt freshman Marcus Mariota.

This season Mariota set the team’s single-season record with 38 touchdowns (32 passing, 5 rushing, 1 receiving), surpassing the previous mark of 36 held by Thomas (2011) and Akili Smith (1998).

The first freshman named to the Pac-12’s all-conference first team in 23 years, Mariota passed for 2,739 yards, completing a school-record 68.5 percent of his passes. He had 3,429 yards of total offense, second only to Smith’s 3,947 in 1998.

Thomas, his predecessor, passed for 2,761 yards and a school-record 33 passing touchdowns his junior season last season despite missing a game because of an injury. He left school with a year of eligibility remaining in hopes of playing in the NFL but went undrafted.

Frost, 38, came to Oregon in 2009 after serving as an assistant at Northern Iowa. He played seven seasons in the NFL after leading the Huskers to the national title over Tennessee in the 1997 Orange Bowl.