If he was paired with a competent owner / front office (not Dan Snyder), I bet Shanahan could still run a very effective offense. I just don’t think his zone blocking scheme is way ahead of the curve like it was 20 years ago, so I doubt he’d be able to replicate the success of the ’96-’98 Broncos.

He definitely was, and I really don’t think it was just in his heyday. Washington only has two in the top 100. One was 1999 under Norv Turner. The other was 2012 under Shanahan. As far as just evaluating his offensive accumen, he had extenuating circumstances for the entire rest of his time in Washington (the awful QBs the first two years and then the whole soap opera of 2013). We also can see two coaches having at least some success running his offense right now in Atlanta and Denver. I think he could probably walk in now and still produce an excellent offense.