Any time you install a new offense, it’s a challenge for everybody.
It's a challenge for the offensive line in terms of how they’re calling protections. It's a challenge for the quarterback, who has to have a clear understanding of where his wide receivers are going and the characteristics of every route. And every offensive coordinator operates differently, so you have to adjust to that.
But it's not like the Patriots are reinventing the wheel.
If you think this is a lot of change...
During my first season with Kansas City in 2009, we spent a whole offseason learning Chan Gailey’s offense, which was brand new to me because it had completely different terminology than what I was used to in New England.