New Carolina Panthers head coach Dave Canales is also a published author — but the book he co-wrote is not about football. Instead, Canales and his wife, Lizzy Canales, co-wrote a deeply personal, faith-based book called “This Marriage? The Question That Changed Everything.” The book was published in September 2022, while Canales was still a fairly obscure assistant coach with the Seattle Seahawks. It contains numerous revelations about Canales’ private life but has gone almost completely unnoticed in NFL circles. In the book, Canales, 42, admits to having had multiple affairs earlier in his l…