Not a mulligan. The headline ran only part of the quote, almost like when Trump left out "on many sides" when he quoted himself in Phoenix.
I understand what Riley meant. There is a new defensive staff and scheme. They have a new style QB to fit a new offensive style. Here's the full quote:
Riley said. "So, new defense, new quarterback. It feels like, in a way, starting over. But the beauty of it is we're not. We've been with many of these kids for two years. That's the fun part of being a coach, is building that trust, those relationships, the culture, the values that you want in a program."