The x-factor in all this is what you're referencing - the familiarity and conformity in direction, culture, message, etc. But we have ZERO evidence that suggests GP will be able to effectively call plays. Game planning is one thing - sure, collaborate. But when the rubber meets the road and we're facing a real, live defense, does he have what it takes? We have no fucking clue. And that's the problem with the hire. BK was an offensive voice with decades of experience so he could manage that. MF is a defensive voice with 1 year as HC under his belt.