We may all be giving Graves too much credit...and also too little.
Viewing the Cardinals since he came in here, my take on Rod (albeit from my vantage point 2,000 miles away and not knowing anyone in the organization personally) is that he's basically a solid pro football "manager" who works closely with his ownership and relies on both ownership and staff to arrive at important personnel decisions.
As such he may receive too little credit for bringing in good support staff and building an organizational structure which taps into every staffer's talents and accomodates all the pulling and tugging among ownership, coaches, scouts and bureaucracy that's a "law of nature" that impacts most organizations and which, if left untethered, can pull a franchise apart.
But, given the collegial nature of decision-making, he probably gets too much credit for good personnel decisions, too much blame for decisions that go wrong and not enough credit for contributing to the overall process of running a team.