Juan Castillo seems like a pretty fired up dude. If his maybe-pandering high-octane introductory press conference doesn't have you convinced, the player testimonials that Athletic writer Kevin Fishbain details probably will. At first glance, it's quite the departure from the stoicism of his predecessor, Harry Hiestand.
Of course, at the end (and also at the beginning, and in the middle) of the day, it makes no difference how engaging your offensive line coach is with the media. What matters to an NFL offense – outside of, you know, results – is how much everyone's on the same page, and it sure does sound like Matt Nagy and Juan Castillo are on the same page.