By Matt Audilet Following the firing of Scott Frost last week, Mickey Joseph stepped up as Nebraska’s interim head coach. During Joseph’s introductory press conference, athletic director Trev Alberts confirmed that the interim leader has the power to make coaching staff changes during his time at the helm. After a blowout loss to No. 6 Oklahoma this past weekend, Joseph made his first big coaching move as interim head coach — firing defensive coordinator Erik Chinander. Joseph explained his decision on Tuesday. “Chins is a good man and a good coach. But the numbers didn’t add up. I didn’t see …