[ChaosTheory]

It's not inherently negative to have your HC calling plays. Andy Reid has had HOF success doing that. And recently you've got guys like Kyle Shannahan, Sean McVay, Matt LaFleur, Zac Taylor, etc. having success.

I suppose it'd be great to have perfect balance with a Tony Dungy, Mike Tomlin, John Harbaugh type in charge while your top-flight OC and DC handle play calls.

The issue is that because of the guys I mentioned above, the top-flight play-callers are vying for HC jobs. So if you want one, they'll want the HC gig. Otherwise they'd stay put. And if you get one, you're not going to take his biggest strength away. Why'd he get the interview in the first place?